How is the radiator fan on a Chevy Cavalier controlled?

A radiator cooling fan on a Chevy Cavalier is controlled by the computer. Its circuit goes from the battery positive to the fuse. From the fuse it travels to two relays: the low-speed and the high-speed relay.

Why does my AC keep blowing hot air?

The most common cause of an AC system blowing warm air is a lack of refrigerant, though, you may also have a problem with your condenser. Other possibilities include a faulty compressor, broken cooling fans, or an issue in your electrical system.

Where is the ECT on a Cavalier radiator?

It is located near the coolant outlet on the upper rear of the hose. When the connector is pulled off of the ECT, within a second or two the fan should come on. If it does come on, the ECT is suspect. Check the voltage with the meter by backprobing the sensor when the engine warms up.

Why is my radiator fan not coming on?

When the connector is pulled off of the ECT, within a second or two the fan should come on. If it does come on, the ECT is suspect. Check the voltage with the meter by backprobing the sensor when the engine warms up.

Why is the AC not working on my Chevy Cavalier?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My A/C Working? What are common reasons my Chevrolet Cavalier has air conditioning 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.

What to do if your cooling fan won’t turn on?

Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.

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.

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

How does the radiator fan on a Cavalier work?

Both of these relays have a separate hot wire to the fan. They are actuated by the computer, which uses the engine coolant temperature (ECT) sensor to determine when to turn the fan on and which relay to actuate dependent on the temperature.

How does a radiator fan work in a car?

They are actuated by the computer, which uses the engine coolant temperature (ECT) sensor to determine when to turn the fan on and which relay to actuate dependent on the temperature. The ECT sensor is a 2-wire thermistor. As engine coolant temperature increases, the thermistor resistance and signal voltage decreases.

What to do if your radiator cooling fan Wont Stop Running?

Remove the lid. Look on the inside of the lid and for the mapping of the fuses and relays with their location. Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off.

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.

How does a high speed radiator fan work?

From the fuse it travels to two relays: the low-speed and the high-speed relay. Both of these relays have a separate hot wire to the fan. They are actuated by the computer, which uses the engine coolant temperature (ECT) sensor to determine when to turn the fan on and which relay to actuate dependent on the temperature.

Why is my radiator fan not turning on?

The computer sends power to the relay to activate it and turn the fan on. Once activated, however, if the relay sticks in the closed position then the fan will run until the battery is totally discharged.

Where is the blower motor on a 1998 Chevy c1500?

This 1998 Chevrolet C1500 came in with a no blower complaint. The starting place for testing is at the blower motor. The blower motor is located behind the passenger side of the dash and is accessed by removing the glove box. After opening the glove box there are two retainers that have to be dealt with.

When to replace the heater fan control switch?

If you have replaced the blower motor and blower motor resistor on your ’95-’98 GM truck or SUV, and your fan only works on high or doesn’t turn on at all, your heater fan control switch needs to be replaced. This video explains on how to do replace this part. Thanks for watching. Loading…

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.

Why does my Chevy Silverado blower motor not run?

If the blower motor runs when all of the terminals were jumped together, it means the circuit between the resistor connector and blower motor is fine as well as the blower’s motor relay, but the blower resistor is bad and needs to be replaced.

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 is my Cavalier 2.2 leaking coolant?

There is a leak due to corrosion in an elbow in the coolant system in my son’s 2002 Cavalier 2.2. The upper radiator hose connects to the elbow, which goes into the engine (block?).

What’s the problem with my 2000 Cavalier heater?

My 2000 cavalier is loosing some serious coolant. There is no sign of external leakage and I’ve checked the oil and it’s normal. There isn’t any smoke either. Where is it going. I’m also loosing power and it’s getting hard to start. The heater blows hot on and off, the thermostat has been replaced and the temp. gauge is on red and fluctuates.

Can a car fan come on when the engine is off?

The fan can come on at any time even with the key off when the engine is warm. Install a jumper wire to the red wire at the harness connector and the black wire to ground. Touch the red jumper to battery positive side and the fan should operate if it is not burnt out.

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.

What to do if your cooling fan won’t stop running?

The fan will discharge the battery quickly if left running. Open the hood and locate the fuse relay box on the driver’s fenderwell. Remove the lid. Look on the inside of the lid and for the mapping of the fuses and relays with their location. Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one.

What is the fuse box diagram for a Chevy Cavalier?

Here you will find fuse box diagrams of Chevrolet Cavalier 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 and 2005, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

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 to troubleshoot a Cavalier radiator fan that is not working?

Install a jumper wire to the red wire at the harness connector and the black wire to ground. Touch the red jumper to battery positive side and the fan should operate if it is not burnt out. If it does not come on, check the connection for a good power and ground on the jumpers. If the connections are good, replace the fan.

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.

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.

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 if my radiator fan is not working?

Inspect the radiator fan by spinning it with the fingers and see if it is free moving. Do this only with the engine off and cool. The fan can come on at any time even with the key off when the engine is warm. Install a jumper wire to the red wire at the harness connector and the black wire to ground.

Why does my Chevy Cavalier not turn on?

1996 Chevy Cavalier 2.2 lt engine. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. It does not turn on, when A/C is turned on ( I realized AC is also not working on my car, it may be related or not).

What to do if your computer cooling fan won’t run?

Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor. The relay, however, has direct power to one side, the same as a light switch.

How does the radiator fan work on a warm engine?

As engine coolant temperature increases, the thermistor resistance and signal voltage decreases. On a cold engine, the voltage is sent through a high resistance circuit in the computer. On a warm engine the voltage is sent through a low-resistance circuit in the computer.

What does it mean when your AC fan doesn’t start?

When the fan doesn’t start even though the AC is turned on, it can be a clear sign that there’s a fault with the motor. When the AC runs without the fan circulating air, it can eventually lead to the evaporator coils freezing over. Once this happens, your air conditioning unit is at risk of suffering more serious damage.

What is the fan motor in an AC unit?

What is an AC Fan Motor? The fan motor is a fairly uncomplicated yet vital part of an air conditioner. It’s the part of the unit that pumps air through the system. Without that circulation of air, your AC won’t cool your home.

There is a leak due to corrosion in an elbow in the coolant system in my son’s 2002 Cavalier 2.2. The upper radiator hose connects to the elbow, which goes into the engine (block?).

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’s cooling fan keep coming on?

Answer: Usually, a problem with a relay or module in the circuit would cause the cooling fan to stay on. If you already replaced the relay, check the module, if your model has one. You may need to locate a grounded wire in the circuit.

What can be the problem with my electric cooling fan?

What could be the problem with my electric cooling fan? Answer: Usually, the problem is with the fan control module. Check for trouble codes, even if the check engine light is not on. On rare cases, the problem is traced back to the car’s computer.

When is the p0480 Chevrolet cooling fan relay control circuit detected?

Most auto repairs shops charge between $75 and $150 per hour. When is the P0480 CHEVROLET code detected? The P0480 code is detected when the Powertrain Control Module (PCM) detects that the commanded state of the driver and the actual state of the control circuit do not match. P0480 CHEVROLET Possible Symptoms

What are common reasons my Chevrolet Cavalier has air conditioning problems?

What are common reasons my Chevrolet Cavalier has air conditioning problems? While there are a variety of reasons your Chevrolet Cavalier air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.

When does the VCM turn off the auxiliary cooling fan?

If the auxiliary cooling fan has been turned ON by high A/C head pressure, the VCM will turn the fan OFF when the pressure has dropped to 250 psi. The minimum ON time for the auxiliary cooling fan is 30 seconds. I’m not seeing the pictures in your post.

Why does the radiator fan run all the time?

The radiator fan may run up to five minutes and sometimes longer. Unless there is an electrical issue, it may stay on all the time until it drains the battery. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated.

Is it normal for a car fan to run all the time?

This is normal in many vehicles, such as BMW or Mercedes-Benz. The radiator fan may run up to five minutes and sometimes longer. Unless there is an electrical issue, it may stay on all the time until it drains the battery. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated.

When was the third generation Chevy Cavalier made?

In this article, we consider the third-generation Chevrolet Cavalier, produced from 1995 to 2005.

How do you change the fan on a Cadillac?

Remove the radiator cap and drain the coolant into a suitable drain pan. Unplug the wiring harness from the switch that you’re replacing. Unscrew the cooling fan control switch from the radiator with a socket wrench. Reuse the coolant that you drain from the radiator only if your Cadillac has recently had its cooling system flushed.

What kind of fan does a Cadillac radiator have?

Depending on the model Cadillac you have, the radiator has either a dual-speed fan or two separate fans. One of the cooling fan control switches reacts to lower temperatures and the other to higher temperatures. You can find and replace one or both fan sensors; removing either of them will require draining the coolant.

Where is the relay wire for a corvette cooling fan?

Locate the dark green/white wire at the relay connector. This will make both cooling fans come on simultaneously, meaning less run time for both fans if the cooling system is in good condition. Route the cooling fan harness dark green or blue wire to the main fan relay (near the battery).

What kind of wiring do I need for a cooling fan?

The cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. It uses a 40-Amp Electric Relay and Electric Fan Sensor. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay (tab 87).

Which is the hot wire on a radiator fan?

Place a jumper wire across the terminal that had power with the key off and the terminal that was dead and did not go to ground. This is the fan hot wire. Set the voltmeter to volts and check the fan wires to see which of the two is the power wire. Mark this wire or remember which one it is. Disconnect the negative cable to the battery.

Do you need a relay kit for a cooling fan?

A relay kit, our part number CCFKRL, will include everything you need to properly wire up your electric cooling fans, with the exception of additional wiring needed to complete all of the circuits. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan.

How is the radiator fan on a Chevy Cavalier controlled?