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Engine over heats fan does not work - 1995 Dodge Caravan

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Hi I am Vortash in there infinite wisdom a lot of car manufacturers today have decided that , the cooling system of a vehicle is best run by the engine management unit ..Wrong !! there are numerous things that can cause overheating and they have just added to the list . If yours is such a system it could be that the water temprature sensor is faulty . the relays are faulty , the ECu is faulty , or the fan motor itself is faulty . It could also mean you have a cylinder head gasket fault , there by the water is being forced out of the system by the pressure of the engine causing overheating , or the water under pressure is leaking into the cylinders causing oil contamination ( if this is so your oil will have emulsified and you will have a white creamy sludge around your oil filler cap and you will require a new head gasket you will need tto check your compression also ).. Or if fate is kind to you your car is still on the old reliable system of a fan switch in the radiator and this may be faultty hence overheating .. however if it has overheated a lot then there is a good chance the head gasket will have gone also .. Regards Vortash

Posted on Jun 22, 2009

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The radiator fan still working several seconds after I turn off the engine.Also during the engine on ,the fan turn on and off rapidly.


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Hoe this helps.

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1 Answer

Cooling fan is not working


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.


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.

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