Question about 2001 Jeep Grand Cherokee

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Over heating fan dont come on at all i have replaced a fan relay also (temperature sensor) next a new electric fan motor dealer parts.

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Make sure you have a thermostat

Posted on Apr 25, 2010

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1 Answer

Engine cooling fans don't come on


COOLING FANS DONT TURN COULD BE FAULTY FAN RELAY.FAULTY PCM AND FAULTY COOLANT TEMPERATURE SENSOR.CODE SCAN FOR FAULTY PCM CODE AND A FAULTY COOLANT TEMPERATURE SENSOR.SEE IF ENGINE COOLANT TEMPERATURE SENSOR IS GIVING CORRECT COOLANT TEMPERATURE USING A CODE SCANNER.IF ENGINE IS 190 DEGREES AND THE ENGINE COOLANT TEMPERATURE SENSOR READING 100 TO 80 DEGREES COOLANT SENSOR IS BAD.HOT WIRE COOLING FAN TO SEE IF FAN MOTOR WORKS.BECAUSE COOLING FAN MOTOR COULD HAVE OPEN CIRCUIT CAUSING ELECTRIC MOTOR NOT TO TURN ON.

May 13, 2011 | 2003 Dodge Stratus

2 Answers

Electric fans do not work. Fuses OK Motors also run if hooked up directly.


If the fans work when hooked up directly. this indicates that the fan motors are okay. The next step is to check if the coolant temperature sensor (usually located near the thermostat housing) to see if it sending a signal to the relay when the engine temperature goes above normal. This part is inexpensive and easily replaced; throw one in if you still have the original. A second sensor (or switch) may need to be checked; this is the radiator fan switch. These two usually work as a "team" in managing engine temperatures; one switch tells the computer and the instrument gauge what temperature your engine is operating in, while the other responds by sending a signal to the radiator fan relay to "kick on" the fan.

Lastly, the radiator fan relay itself may have burned out. I usually try to switch out identical relays to determine if this is the problem.


Hope this helps.


Have a Nice Day !!!

Apr 15, 2011 | 1996 Ford Windstar

1 Answer

Cooling fans not running


HI. I have a very thorough, step by step procedure that will help troubleshoot this issue. follow carefully, to isolate the problem, Use extreme caution when preforming this inspection procedure.



1.Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.


2.Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.


3.Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.


4.Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.


5.Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.


6.Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.


7.Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

Aug 24, 2010 | 2000 Toyota Sienna

2 Answers

I have a 1999 chevy cavalier and the cooling fan will not start


CHECK COOLING FAN FUSE AND RELAY.IF BOTH GOOD SCAN CAR TO CHECK COOLANT TEMPERATURE SENSOR FAULT CODE.THE PCM AND COOLANT TEMP. SENSOR IS WHAT CAUSE FAN TO RUN AT CERTAIN TEMPERATURE.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN REPLACE FAN MOTOR.IF FAN RUNS YOU HAVE SHORT OR BROKE WIRE IN THE COOLING FAN ELECTRICAL CONNECTOR.

May 06, 2010 | 1999 Chevrolet Cavalier

1 Answer

Electric cooling fan not working?


SCAN CAR FOR A FAULTY COOLANT TEMPERATURE SENSOR.IF SENSOR GOOD CHECK COOLING FAN FUSE AND RELAY.IT BOTH OKAY.HOT WIRE COOLANT FAN USING JUMPER WIRES TO BATTERY IF FAN DONT WORK REPLACE THE FAN MOTOR.IF COOLANT TEMPERATURE IS BAD REPLACE IT.BECAUSE IT CONTROLS THE FAN TURNING ON WHEN COOLANT GETS A CERTAIN TEMPERATURE.

May 04, 2010 | 2001 Kia Sephia

2 Answers

AC electric fans do not work???


First, hot wire the fan motor to the battery. If it works, then locate the relay in the power distribution center and change it. Also check any fuses related.

Jun 08, 2009 | 1999 Jeep Cherokee

1 Answer

Radiator cooling fan


check coolant first .if all good .hot wire the fan make sure the electric fan motor is operating.if runs when hot wire.replace the relay and coolant temperature sensor.if fan dont run.when hot wire.replace the fan motor.

May 30, 2009 | 1999 Oldsmobile Alero

2 Answers

99corvette overheating


Hi, I put together a guide that will help you diagnose this issue. it will help you troubleshoot all problem areas and lead you to the problem at hand.


Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to Keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.



  • Most automotive service manuals will show the wiring diagrams for the different electrical and electronic system components. Having the service manual for your car handy to locate components and look up specifications will make your troubleshooting task much easier.
  • A service manual can be purchased at most auto part stores. Also, most public libraries maintain an updated section of automotive service manuals that you can consult free of charge.
  • Keep your hands away from the fan, belts, or any other moving parts while working on your engine, they can easily catch and rip through your fingers, hands and arms.
  • Always wear short sleeve shirts and avoid wearing jewelry or watches while working on your car engine, especially while the engine is running. Clothes and jewelry can get trapped in moving engine parts and cause severe injury.
Please rate and have a great day:)

Apr 28, 2009 | 1999 Chevrolet Corvette

3 Answers

Electric fan on rad won't cycle.


It has a fan controller module that is controlled by the computer. The module is usually the failure. Here's the bad news, its below the passenger headlight and core support that holds the headlamp and radiator in place. It's pretty small, held on with two bolts. I remove the headlamp. I drill a hole through the plastic support to put socket and extension to get to one of the bolts.

Apr 05, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Cooling fan won't come on.


HI. I have prepared some steps for you to follow.This will aid you will the troubleshooting.


Step1 Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail. Step2 Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow. Step3 Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector. Step4 Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing. Step5 Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan. Step6 Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one. Step7 Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

Please rate and god bless..

Mar 21, 2009 | 1992 Dodge Spirit

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