2007-10-05 17:26:07 · 3 answers · asked by michael r 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
I own a shop, and the first thing you want to do is check the fuses. The computer gets a signal from the temperature sensor and AC unit to turn on the fan/fans, and activates a relay in which powers up the fans. Try putting on your AC and see if that turns on the fans. If it does, then you probably have a bad temperature sensor. If not, then the relay has probably gone out on it, or you have lost power to the relay via a blown fuse. You can remove the plug from the temperature sensor, and jump it with a wire. If the fans work then, you have a bad sensor. A word of caution; some have more than one sensor for the temperature, and the one you need should be around the thermostat housing where the radiator hose comes out of the engine. The switch that runs the fan is a thermo switch, and works to ground, so by jumping it out you are bypassing the switch.
Glad to help out, Good Luck!!!
2007-10-06 02:00:32 · answer #1 · answered by Anonymous · 0⤊ 0⤋
These coolant fan motors are turned on by the PCM sensing the motor's temperature through the coolant temp. sensor that is located somewhere close to the thermostat housing. If you have access to a scanner, check the motor's temp and determine if the data is accurate first. If the data looks okay, locate the coolant fan relay under the hood. Remove the relay and test the power and ground supplies to it. With the ignition on there should be two power supplies and no ground. The PCM grounds this relay through the smaller circuit wires. The relay connects the big circuit wires together and directs the power to the motor. Normally the problem lies within the motor itself being burnt out which normally takes the relay out with it. It can also burn up the fusible link that supplies the relay's big wire power. If this is the case you would have to replace the coolant fan motor, the relay and the fusible link. Do some checking before replacing things.
2007-10-06 14:51:41 · answer #2 · answered by Deano 7 · 0⤊ 1⤋
you more than likely have a bad fan switch,this is what makes them come on,its usually mounted somewhere around the thermostat housing,id have a shop take a look at it though it can be other things causing this to happen,and a shop can probably find the problem a lot faster which will save you money.good luck with it.
2007-10-06 00:36:30 · answer #3 · answered by dodge man 7 · 0⤊ 1⤋