Question about 1998 Cadillac DeVille
1) Does the fan come on when you turn on the AC compressor? (By the way, if it does not, DO NOT use the AC until you get that fan fixed, else you risk damage to your AC compressor). If the fan does not come on when you run the AC compressor, then you may very well have a bad fan motor, or you may have a bad fan relay. You could have both problems too; a bad fan motor eats a lot of current and so tends to damage the fan relay before it finally goes out. So if you replace the fan motor, I recommend you replace the fan relay as well. The fan relay is often found in or around the fues box, or possibly in a row of relays next to the firewall (Consult a Haynes or Chilton manual if need be).
2) If the fan does come on when you run the AC, then very likely you have a bad thermostatic switch. In many cars, this is found in the vicinity of the thermostat housing cover, and has a connector with two wires going to it. If you can locate it for sure, you can test it by shorting the two terminals inside the connector with a paper clip, and if the fan and its relay are ok, the the fan should start running (even if the car is "off", so be careful). If you short the two terminals inside the connector and nothing happens, do suspect something else, like the fan and/or its relay.
3) Until you figure this out and get it fixed, suggest to do the following:
A) DO NOT run the AC.
B) When the temperature starts to climb, open the windows, and run the heater on "HIGH". It may be uncomfortable, but I assure you, it WILL get you home, to do this. The reason is, your heater core is in fact a small radiator with its own fan, and in fact even if you have a stuck thermostat this trick still works because the water to the heater bypasses the thermostat.
Posted on Mar 28, 2011
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Posted on Jan 02, 2017
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