Chevy lumina fans do not turn on
The car overheats. I have to run the heater to keep it on normal. I have
replaced the fan relays and the coolant temperature sensor. Still nothing. I
jumped the relays with wire and the fans turn on. Please let me know what
you think.. need ideas of what to check now.
There could be a couple things causing it how is your knowledge with cars
My knowledge is medium. Ok I will look for the fan switch
Note the diagram. See the fuses at the top, check them all. Also, use a test light and check for voltage at the fuses. Some fuses are hot all the time and some go hot with the key on, check both ways if needed. See the relays, two sides to relay, there is the load side, that line with arrowhead, then there is the control side, other side in diagram. Control side needs voltage and ground to energize, top wire for control side is voltage and fuse protected. The bottom wire for control side of relay, is ground and grounded by the pcm. If you turn on the ac, the fans should run. In some vehicles, if you unplug the coolant temp sensor, the fan would run all the time, it's a default setting because you unplugged the sensor. There is a code or codes for cooling fan, any codes? good luck
