SOURCE: 1999 Pontiac Grand Prix Overheating
I had trouble with overheating on my 2000 Grand Am, The dealer could not even resolve the issue,(they wanted to replace the intake gaskets)...I knew that was not the issue, no air leaks or water leaking there; so I sit down to think; what are the causes of overheating. Thermostat sticking - nope not it, water circulates, Water leak - nope not it, has water stays until it gets too hot and goes out overflow, fans working - yep...hummmm the only other thing I could think of was losing of water pressure, yep that's it - the cap on the coolant tank was going bad, got a new cap ($8.00) replaced the old one and no more trouble going on 6 months now.
Hope this may solve your issue.
SOURCE: 1997 Sunfire - Radiator fan not working.
It is most likely the temp sensor. you can test sensor and all wires with an ohmmeter. On the ohm setting, place one probe on one end of wiring or sensor, and the other on the other end and there should be a reading.
SOURCE: 1996 Grand Prix SE, cooling fans inop
try the fuse,if not that the wiring is bad from the fan to the switch.
SOURCE: radiator fan not workin and causing car to get hot
It is possible that you'll need to replace the fan motor or the entire unit if the motor it'self can not be replace separately from the fan.
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