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CHECK COOLANT FAN FUSE/RELAY.IF BOTH GOOD HOTWIRE COOLANT FAN IF RUN COOLANT TEMPERATURE SENSOR BAD OR FAULT IN FAN WIRING.IF COOLING FAN DONT RUN WHEN HOT WIRED REPLACED FAN MOTOT.
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Hi Julie, the dual fan cooling system generally works with the larger fan being the radiator cooling fan and the smaller fan being the A/C cooling fan! If you start the vehicle and turn on the A/C and select the coldest setting within a few seconds both fans should start working!
Likely somebody didn't hook up the fan(s) properly when the radiator was replaced.. OR ... hopefully, this wasn't a case where the original problem with the car was the cooling fans not working.... and somebody diagnosed the problem as a clogged radiator????? I had the same problem recently with the fans not working, and the problem was a relay switch that turned on the fans when more cooling was needed.....
had the same problem in 1994 grand am, done all that and wiring harnness never found it , put jumper wire to ingition switch turn the key on fan came on.. its not right but it fixed it for ten years. before doing this check for power to relay look at plugs to relay and prongs for fuses. Some ans are controled by ingition switch, remove key from ring while running lift key see if it comes on
could be radiator fan switch, to test turn on AC and see if fan comes on, if not locate the relays for the fan and jump them out if fan comes on replace the relay (some models will have multiple relays for three speed engine fan operation. here's a link to help diagnose http://www.aa1car.com/library/electric_cooling_fan.htm
P1491 - Radiator Fan Control Relay Circuit Open Or Shorted
When monitored: with the ignition key on, battery voltage greater than 10.0 volts and the pcm requests the radiator fan to be turned on. Set condition: an open or shorted circuit is detected in the radiator fan relay control circuit.
Possible causes radiator fan ctrl rly circuit wire harn intermittent defect radiator fan ctrl rly circuit wire harn observable defect radiator fan relay ground circuit open rad fan relay control circuit open radiator fan relay control circuit short to ground rad fan control relay defective pcm defective
either the fan is bad or you need a temp. sensor, to check fans, run a wire from positive on fan wires to positive on battery, if need be ground fans!! if they are ok the fan should start running,,
Check the fluid level in the radiator - after it cools down !
It sounds like you should replace the temperature sensor that controls the fan. This is usually located in the radiator and has electrical wires connected to it. Trace the wires from the radiator fan ( not the air conditioner fan!) to the sensor.
If the radiator is aluminum you may need special anti-freeze to prevent damage.
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