Cooling Fans on 1995 Chevrolet Monte Carlo

The cooling fans do not turn on. I have replaced the Fan relays, ECT sensor, as well as checked the fans themself using direct power. The only way I can get the fan to come on is by disconnecting the ECT vavle; they then both turn on and run just fine. I'm thinking either a bad wire going from the ECT switch to the PCM or a bad PCM. Could I just run the wires from the ECT switch to a toggle switch and open and close the circuit and control the fans that way?

by in Savage, MN on June 09, 2011
1 answer 1 comment
ANSWER by on June 09, 2011
Since the fans come on when you disconnect the ECT sensor (as they should), then the wiring must be OK between the PCM and the sensor. I don't have much information, but I'd suspect the PCM if the temp gets up high enough to turn on the fans and they don't come on. The only other thing that comes to mind is that if the coolant level is low then the ECT may not be able to sense the temperature well enough to turn on the fans. This happens often enough to mention it... If you want to find a GM specialist, here's our directory link for you:
COMMENT by on June 09, 2011
Thanks, The coolant level is fine. The car only get hots in stop and go traffic when its warm out because the fans don't kick on. I'm thinking its the PCM, this is just my beater car so I don't want to spend a lot of money. Any downfalls of disconnecting the ECT or put it on a swtich?
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