Why are my coolant fans not running when AC is turned on?

Coolant fans not running when ac is turned on. AC compressor clutch engage then it will disengage. System has freon in it. It was working find but now nothin7. My car has 234565 miles. My car has an automatic transmission.

What causes a cooling fan relay to stop working?

Cooling fan relays can stop working for any number of reasons. Common causes for relays going bad include: There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. The easiest method is to start the engine and then turn on the air conditioning.

Why does my Jetta not have a cooling fan?

Simply the engine is not hot enough to turn on the cooling fan, its not hot enough outside, you are driving getting plenty of air flow through the grille to keep things cool without the assistance of the fan. Its possible that you have no problem at all. Was this answer helpful? I got a 2002 Jetta the cooling fans don’t turn on .

Why does my PCM not turn on the fans?

You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. This should happen as the high side of the system approaches 214 psi. If it exceeds this amount of pressure and the system doesn’t turn on, one of the sensors in the system that the PCM uses to know when to turn the system on and off has failed.

Why does my car have a radiator fan?

You probably already know the purpose of the radiator and the cooling system in your car. When you are driving fast, the wind is passing through the radiator to cool the coolant down without issues, but when you are driving slow, there is no wind pushed through the radiator. This is why we use a radiator fan.

Why does my car turn off when the AC is on?

My car has an automatic transmission. With A/C systems, it is important to know in what order things turn on and off. From your description, it sounds as though the compressor clutch is only engaging for a short period of time. This is usually due to a low refrigerant level.

What to do if your Chevy Impala cooling fan is not working?

Removing the wire from the temp sensor puts the fans into stay-alive mode, and they run constantly as you found out. Have the relay replaced and you should be fine. As far as the AC, it is most likely related to your cooling fan problem.

How does a radiator fan work when the AC is on?

The electric radiator cooling fan assembly is controlled by a thermoswitch located in the side of the radiator. At higher coolant temperatures, the switch closes to start the cooling fans. Any time the coolant temperature rises to higher than normal levels, the fan will start and continue to run until coolant temperature returns to a normal range.

Why is the radiator fan not working on my Chevy Uplander?

Your Chevy Uplander ‘s radiator fan has one of the most important jobs on the vehicle. It is the last line of defense between you and an overheating engine. If the radiator fan is not working, it’s a serious problem. Just because the radiator fan is not on does not mean that it is not working. They are designed to only run when needed.

Why is my Chevy Uplander blowing hot air?

When the air conditioner in your 2008 Chevrolet Uplander starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system.

What kind of refrigerant does a Chevy Uplander use?

Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your Uplander consists of a compressor that is belt-driven, an evaporator and freon.

How can I tell if my radiator fan is working?

When a radiator fan works it usually makes a whirring sound that is easily noticeable. However, the radiator fan does not always start spinning on ignition. The ECU signals the radiator fan to work at the precise time. So, do not worry if the fan doesn’t immediately start working. Visually check the fan if you don’t hear its noise. 1. Broken Fuse

Why is the radiator fan not working on my Chevy Silverado?

If your Silverado has a bad engine temp sensor the radiator fan won’t know to come on, because the ECU won’t know how hot the engine is. You’ll need to locate and test the engine temp sensor.

Why do you need a radiator fan in a car?

To stop the engine from overheating, we take the help of coolants that flow through a radiator into the engine. The radiator’s job is to keep the coolant cool so that when it returns back into the engine, it is able to absorb more heat. A radiator fan is thus used to keep the temperature of the coolant in check. Thus, it has an important job.

Is the cooling fan relay on a Chrysler working?

The cooling fans on Chrysler cars are not particularly well-made, but that doesn’t mean you can assume that they are broken the second the cooling system stops working. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler.

What should I do if my radiator fan is not working?

A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan. The fan itself often uses a big fuse of around 50A, while there might also be a separate small fuse to the fan control module.

How can I tell if my air conditioner relays are working?

This part can get really complicated, but the first thing to do is run the A/C with gauges connected to observe the system pressures and monitor the circuit from the PCM to the relays. You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans.

What to do if your Honda AC Fan is not working?

DO this easy check First! If your Honda Fans aren’t working it can be easy repair. I found that both the radiator fan and the AC fan weren’t working. or replace the fans, relays, temperature switch or even the fuses. The temperature switch is an easy repair and it’s even easier to replace. You can get the part from Amazon.com for cheap!

What are the signs of a bad cooling fan?

Common signs include the engine running hot and cooling fans either not functioning or running all the time. 1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.

Can a car run without a radiator fan?

Yes, your car can still run without a radiator fan, but you never should. Your vehicle’s cooling system is crucial to the engine’s performance and lifespan. Every time your engine overheats, you’re causing tremendous damage to the precious engine.

When to troubleshoot an electric car cooling fan?

On a warm engine, the fan may come on even if the engine is not running. When working on a hot engine or an engine that is running, keep your hands and tools away from the fan blades and moving components. Troubleshooting a cooling fan that doesn’t work can be a relatively straightforward task at times.

Why does my car overheat when I Turn on the fan?

The cooling fan, which is behind the radiator grille, removes heat from the engine’s coolant. This fan is electrically controlled and relies on the signal from the onboard computer. If the fan receives a false signal, the fan might not turn on, causing the engine to overheat.

Why are the cooling fans not working on my car?

1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.

Why does my car heat up when I’m not driving?

If you have an electric cooling fan that isn’t coming on, this can cause your engine to overheat. This fan draws cooler air through your radiator when your car isn’t going fast enough to do the job naturally. You can test this by letting your car idle long enough for the engine to heat up.

How does a radiator fan work in a car?

The fan should also turn on after switching on the air conditioner. Positioned between the radiator and engine, cooling fans blow cooling air through the car’s radiator to cool down the heated water and coolant mixture that flows through the radiator. The radiator fans blow cooling air through the car’s radiator. Source: Adobe Stock

Where is the relay on a radiator fan?

The fan relay is often located in the engine bay’s fuse box, but the best way is to check your repair manual to find where it is located. Testing a 4 pin relay is often very straightforward. Remove the relay and give 12 volts to pin 30 and 85. Ground pin 86 and check if there is voltage coming out from pin 87.

What should I do about my Chrysler cooling fan?

Chrysler cooling fans are a common fault. However they can be a little puzzling to test. Review the electrical diagram before you begin and this should help Chrysler cooling fans are a common fault. However they can be a little puzzling to test. Review the electrical diagram before you begin and this should help Skip navigation Sign in

Is there a way to test a radiator fan?

You can test the electrical radiator fans by taking a wire from the car battery, unplug the radiator fan connector, and put 12v+ and ground into the connector. This is the fastest and easiest way to test your radiator fans. Because the radiator fan is often drawing so much power, there is often a relay that is powering the coolant fan.

How does the PCM turn on the cooling fan?

The PCM turns on the fan through either the high or low speed fan relay. The PCM provides a ground to the relay’s control circuit. ? Engine coolant temperature ?

What happens if you have a bad cooling fan relay?

The check engine light illuminating may indicate a faulty cooling fan relay. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance. The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan.

How do you test a Chevy Silverado cooling fan?

A quick test of the cooling fan system is turn the key to on and pull the connector off the engine coolant temperature senor on the intake, the fans will turn on by default. You can’t post conmments that contain an email address. Can I use the belt for the aveo5 that has no A.C. as a bypass to not have to buy a New A.C.?

What does it mean when a / C compressor does not engage?

A/C compressor clutch does not engage, cooling fan does n… Q: A/C compressor clutch does not engage, cooling fan does not turn on, condenser fan does not turn on, and ceiling light does not turn on.

What to do if your a / C switch is not working?

If there is no voltage to the sensors, then the a/c switch would need to be replaced. The cooling fans and condenser fans either are not coming on from a loss of power or the motors are burned up. First check the cooling fan circuit. If there is no power to the cooling fan, then check the fuses and see if they are burned.

Can a climate control system work with no fan?

It will still work with no fan, and you’ll usually still be able to control the temperature of the air that is blowing or trickling, out. But a climate control system with no fan to push the air around is anything but controlled.

What to do if your heat pump fan is not turning?

Heat Pump AC Condenser Fan Motor Not Turning 1 PSC Motor Solutions – Problem One. Back to the PSC motor and flicking it with the screwdriver. 2 Drip Plug for Condensation Removal. 3 Taking Care of Problem Two with the Condenser Fan Motor Not Turning. 4 Heat Pumps in the Winter | Heat Pump Fan Not Spinning. …

Why is my condenser fan motor getting hot?

The most common problem associated with the condenser fan motor getting hot and then stopping is likely the fan capacitor. For a condenser the capacitor is typically a dual capacitor. The dual capacitor is a run capacitor that serves both the compressor and the condenser fan motor.

What should I do if my AC Fan is not working?

Replacing the AC fan motor is not that difficult and if you have any mechanical skill, then it should only take you about 2 hours to so. Here are the steps to replace the motor. Once you have seen there is no power coming to the fan motor, remove the screws holding the motor and squirrel cage Remove the squirrel cage from the motor.

What happens when a condenser fan motor overheats?

Most condenser fan motors have been designed to operate at temperatures up to around 150F. When there is something wrong with the fan motor, it can overheat and cause problems with the HVAC system. What Does a Condenser Fan Motor Do? A condenser fan motor is part of your HVAC system that is located within the condensing unit.

What happens when a car fan is not working?

That means a trickle out of your vents instead of the rush you asked for. When it does happen, you’re left with a miserably underpowered heat or AC system. It will still work with no fan, and you’ll usually still be able to control the temperature of the air that is blowing or trickling, out.

Why does my Dodge Caravan have no heat?

My problem is on a 1996 Dodge Caravan 3.3 liter. It has A/C but is a short body and has no rear heat or A/C. The trouble relates to the blower motor and its activation. My blower motor does come on. The Haynes manual says the blower is activated by a relay. I need to find the location of this front blower relay and the fuse that powers it.

What happens if your coolant level is low?

If your coolant level is low, there is a chance that you will get air in the system, and the coolant temperature sensor will not read the coolant temperature correctly. If the coolant level is low, you need to refill the coolant to optimum levels. Failing to do so could risk your engine becoming overheated and seized.

What are the symptoms of a bad cooling fan relay?

1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

When to turn on the engine cooling fan?

Anway thanks again – saved me making a fool of myself at the dealers. if you have climate control (DEATC) rather than just air con, the fan will only be active when the compressor is running i.e. refrigerant is actually flowing through the system.

Why does the a / C come on with the engine fan?

As above, I believe the engine fan comes on with the A/C to help cool the air coming into the cabin. The Mk7 engine fan does seem to come on a lot though, or it’s much more noticeable than my Mk6.5’s engine fan, because I rarely noticed that.

Why are my cooling fans running at all times?

3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.

How often does a car cooling fan stay on?

Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.

When does the radiator turn on when the AC is on?

When the AC is switched on, the compressor clicks on. HOWEVER, the radiator fan does not turn on with the compressor. The rad fan only comes on when the engine gets hot, and it works well to keep the engine temps down. HOWEVER, it is only one speed (a low speed).

What should I do if my car fan is not working?

Blower still does not work. Checked continuity of 40 amp blower fuse; it’s okay. Checked most fuses for continuity in the PDC and Junction Box and they are okay. Note, there is no burnt or corroded wiring.

Why is my heat not working in my car?

One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. That means a trickle out of your vents instead of the rush you asked for. When it does happen, you’re left with a miserably underpowered heat or AC system.

Why is my Lincoln Town car heater not working?

While there are a variety of reasons your Lincoln Town Car heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What to do when your AC Fan is not working?

Checked for incoming resistance ground to the blower, from the dash control switch and it works. Checked for battery at the blower, when the car is running. There is no battery to operate the blower. Rotated all the PDC relays around, they have the same ID, other than ABS pump.

What to look for when your car fan is not working?

Your vehicle should have a complete relay diagram showing the location of all of the vehicle’s electrical components such as fuses and relays. To fix any blower, the first things to look at are the fuses, relays, and electrical connections.

Which is a symptom of a faulty cooling fan?

The most obvious symptom of a faulty cooling fan system is the increase in warm or hot air in your cabin. A broken cooling fan system will affect the motors that run the blower causing them to supply less fresh air into the cabin of the car.

How to repair a cooling fan in your car?

Cooling fan. How to repair a cooling fan in your car DIY with Scotty Kilmer. How to inspect and repair a cooling fan that’s not working. There’s many reasons why a cooling fan could stop working, such as a bad sensor, relay, fuse and more. DIY car repair with Scotty Kilmer, an auto mechanic for the last 42 years. 1.

When do you Know Your AC fan motor is bad?

If the compressor is working but the fan blades are not spinning, the motor is faulty. That’s your cue to turn the system off and call the pros to repair the AC fan motor. Replacing an HVAC motor is a job that can be done quickly once the problem is identified.

Is the radiator supposed to turn on when AC is on?

Both radiator fans should always run when the AC compressor is engaged. Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F. Click to see full answer. Then, is the fan supposed to be on when AC is on? The fan only turns on when cooling or heating (in winter) is required.

When does the cooling fan come on in a car?

Beside above, when should the cooling fan come on? To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective.

What to do if your radiator fan is not turned on?

First point of call is to get your car scanned and see what codes come up if any. Also find the relay for the fans and see if it is faulty. They are mostly all the same and can often be interchanged. Find a non critical one like the Horn or headlight relay and swap it out with the fan relay.

When does the air conditioner fan come on?

To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective.

What happens when the AC fan fails in a Ford Explorer?

When it fails, the fan will run at random settings, and the climate control will be inaccurate. Note: this does not affect the temperature of the air that comes from the vents, it affects the amount of air that comes from the vents.

Where is the AC unit on a Ford Explorer?

The control unit is located behind the glove box in most models, and removal and installation takes only minutes. Also note: this only applies to vehicles with single or dual automatic climate control. The average cost for a Ford Explorer AC Diagnosis is between $53 -$67. Learn More

Why is my a / C fan not running when the AC is turned on?

Many people confuse pressure in the system for the system being full. Volume and pressure are two different properties of a gas, which the refrigerant in your A/C system is a gas when it is allowed to escape to the atmosphere. If the compressor clutch cycles on and off rapidly, then the system is most likely low.

Why are my coolant fans not turning on?

If both fans operate then it is time to take a look at the pressure transducer. Don’t let this strange name fool you, it is simply a sensor that relays the amount of pressure in the system to the PCM and the PCM decides when to turn on the fans and or compressor clutch.

Why are the fans on my car not turning on?

If the fans fail to operate only with the AC, but do come on in normal hot engine conditions, then the fuse and relays are fine – it’s a command problem at the ECU or the AC controller. In addition, I would suspect the computer last.

Why is my AC unit not spinning outside?

So, you do some investigating and realize that even though the outside unit is buzzing, the fan isn’t spinning. While this is a fairly common problem, the underlying causes are varied. Typical reasons an outside fan might stop spinning include: When an outside fan fails, the most likely cause is a capacitor issue.

When does a / C switch on, cooling fan does?

It is my undersanding when you switch thea/c control on the cooling fan should come on to cool the condenser but this is not happening. Since the fan is not on, the freon actually seems to boil in the condenser causing the compressor to cycle and excessive low side pressure because of the condenser not being cooled down

What are the symptoms of a bad coolant fan switch?

A common sign of a faulty switch, which can also be alarming, is that the switch will simply not turn the fans on at the predetermined temperature level resulting in engine heat climbing above what it should be in order to run effectively.

Can a bad fan switch cause engine damage?

When this happens, the result can be extremely damaging, resulting in thousands of dollars in engine damage. A common sign of a faulty switch, which can also be alarming, is that the switch will simply not turn the fans on at the predetermined temperature level resulting in engine heat climbing above what it should be in order to run effectively.

What causes a car fan to run all the time?

If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times. Depending on the wiring setup of the vehicle, this may cause them to stay on even when the vehicle is off, which will drain the battery.

When to turn on the cooling fan relay?

The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures. Usually a faulty cooling fan relay will produce a few symptoms that can alert the driver that service may be required.

Why does my air conditioner not work when idling?

When idling, AC does not work and engine overheats. What’s the cause? I drive a 2013 Chevy Sonic. Basically, the air conditioning does not blow cold air if the car is idling, only when in motion. It seems to blow the coldest during long periods of driving fast, such as on the freeway.

Why does my car overheat when I Turn on the a / C?

If the a/c cycles (turns on/off itself) then it can be the pressure sensors working (either low pressure, or high pressure sensors). However: engine overheating is an engine problem (timing or engine cooling system, or even low oil level) NOT induced by the a/c system.

How to troubleshoot an electric cooling fan problem?

1.Has the Cooling Fan Actually Failed? 1 If the fan comes on when the AC is running at MAX, but doesn’t run when the engine is hot, check the temperature sensor… 2 If the fan fails to come on, first check for a fan blown fuse or triggered breaker. On older vehicle models, you may… More

Why does my radiator fan not turn on?

If the plug is disconnected, or the wires are damaged, that could be the problem. Some vehicles with longitudinal engines, and all vehicles with transverse engines, use electric radiator fans. These fans are mounted on or near the radiator, and they are designed to switch on when airflow through the radiator isn’t sufficient.

What causes a car cooling fan to run continuously?

2. A cooling fan temperature switch (or sensor, in some vehicles) can also get stuck, which may cause the fan to run continuously any time you turn the ignition key on or start the engine. Troubleshoot the switch. 3.

How can you tell if your AC switch is failing?

If you begin to notice that the AC system is not blowing as cold as it used to, then that may be a sign that the switch has failed, or is beginning to fail. If the switch is not operating correctly, the AC system will not be pressurized correctly and will not work as efficiently in cooling the air.

Why is my car AC not blowing cool air?

It’s a nightmare to find your car AC not blowing cool air in burning summers. But, people generally face this issue. Your car includes various parts that are interconnected with each other. Therefore, even if you have recharged the AC of your vehicle, the issue in other car machinery can affect its working too.

Why does my Acura heater smell like engine coolant?

A failing heater core may cause the car’s interior to smell like engine coolant. The smell will become worse when the heater is turned on. The engine may also begin to run hotte…

What does it mean when your radiator fan is not working?

This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.

What to do if your car heater is not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My Heater Working? What are common reasons my Lincoln Town Car has heater problems?

Why does the radiator fan not come on when the AC is on?

In order for the AC Condensor to do its job it must stay as cool as it can. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem.

Can a bad capacitor cause a fan not to start?

You took over its job of kick-starting the fan by pushing the blades. If the fan doesn’t start running, you may have a bad fan motor. If you have difficulty getting the blades to turn, there may be debris wrapped around the fan axle, or the motor bearings may be dirty or jammed. Here’s a second way to check for a bad capacitor.

Why is the fan not working on my Mustang?

If you do not have power and the relay swap did not work, then you will need to have the computer checked to see if its able to turn on and off the fan using a dealer scanner. The problem is most likely the relay or fan motor. The statements expressed above are only for informational purposes and should be independently verified.

Why does my radiator fan run when I unplug the sensor?

If I unplug the sensor the fans run. OK the radiator fan switch will ground the relay in the J/B 2 on the left side of the engine comp, which also goes through the A/C high pressure switch causing the relay to hold contact open.

What kind of fan does a Mustang have?

Your vehicle fan is controlled by two different relays in the engine compartment fuse box. One is for low speed and the other is for high speed. The ECM controls both of the relays. The wires to the cooling fan motor are black (ground) brown (high speed) green with white stripe (low speed).

Why is my radiator fan not working on my Mustang?

A frozen caliper, or sticking caliper slide bolt will cause a wear imbalance, and should… The coolant temperature sensor on this engine sends a feed back voltage data to the computer. The computer uses this data to monitor the engine temperature from about minus 40 degrees F to over 300 degrees F.

What should temp be when cooling fan does not come on?

NOTE: if the cooling fan doesn’t come on when the engine has been operating for 20 minutes or more, make sure that coolant is reaching operating temperature, around 220°F (104°C). You may be dealing with a stuck-open thermostat.

Why are my coolant fans not running when AC is turned on?