Ok first off it only has one speed not several. Here are all the componants that help insure the fan work one is fuse 10 amp hot when key is in run possition. Then there is the fuse link in the front of the engine compartment hot at all times. They both go to the cooling fan relay at the right side of the engine compartment then one wire (dk green with yellow stripe) go to the cooling fan control module hot when key in run. Then a yellow wire goes from the module to the coolant temp sensor and a ground back from the sensor. When the computer sees the temp then it turns the fan on via powering up the cooling fan relay and turn on the fan. The A/C will turn it on as a bypass. So the computer part of the thing is working other wise it would not turn on when you unplug the sensor. So this is that it needed to do.
With your multi meter set on 20 volt scale you will need to check the relay for power ok. It is on the right side of the engine compartment it will have a red, brown, green, and a red with black stripe wire going to it ok. Now check the red wire it should be hot or have better then 10 volts all the time. Now check the brown wire it should be hot when the key is on in the run possition (engine does not need to be running). Now if that checkes out ok then we will check the electonic control module for the fan. Get back to me with what you find and we will go from there.
Tuesday, March 17th, 2009 AT 10:35 AM