You need to get a multimeter or a test light. Unplug the connector attached to the fan that is not working and check for 12volts of power at the connection. If you have power at the connection then your fan motor is bad and you will need a new one. If you do not have power at the connection then I would check the fan relays associated with the system. They are usually located in a black box under the hood and they should be marked. Your fan relay may have gone bad. You can also checked the fuses inside thec ar and make sure you do not have a blown fuse, if you have a blown fuse it may be just a fluke or it could be a sign of an intermittant shorting problem in the wiring of the the fan and attached components.
We first have to determine whether its the a/c fan or the cooling fan.
Turn on the a/c , the fan that is working when you turn on a/c is your a/c fan.The one that doesn't is your cooling fan.
I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch(CTS) aka thermal switch and its circuit. CTS is usually located in the water jacket by the t-stat.
The simplest way to tell if it's the fan or the relay (thermostatic switch) is to unplug both fans and then plug the "bad" fan into the "good" fan's connector. (NOTE: you may need to remove the fan from its mount in order to reach the plug on the other fan.) If the fan now works, you need to replace the relay. If it doesn't work, the fan itself is bad and will need to be replaced. You can pick up a new fan or relay at any reputable parts store.
Bill B
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