I have the following vehicle:
94 Buick Skylark
76,000 original miles
The engine coolant fan will not come on when the coolant temperature rises or when the A/C is turned on. As a result, the A/C compressor cuts out on high pressure (the lines get very hot) and the engine overheats. The temperature drops and the A/C compressor turns on whenever the vehicle is in motion.
I have found the coolant fan relay, and I jumpered the always hot terminal 30 to the coolant fan motor terminal and the coolant fan runs fine. What could be the cause of the fan not coming on? Is it a computer problem? I had someone tell me the A/C sensor could be bad, but would this prevent the coolant fan from running when the engine overheats?
Wednesday, September 5th, 2007 AT 11:48 AM