Question about 1998 Oldsmobile Achieva

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Overheating fan will not run ! I change cooling sensor, fan relay,new radiator, thermostat, fan motor, check all fuses, tank low coolint sensor, put fresh coolant in also. (1998 achieva SL 3100 V6 SFI ) The only time i get fan to run is when i pull connector off cooling sensor. change this sensor twice to be shure. sensor has voltage on it about 5 v bench test fan also works fine. When coolint sensor is disconected the fan will run and keep running until i connect it back to sensor then it shuts off. Guage in car reads pass the half way mark and engine get pretty hot at this point and starting to steam and our boil over. At this point i shut engine down in fear of brusting something everything is new. HELP I RAN OUT OF PARTS THANKS !

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There isa short in the wiring somewhere,which a shop can check for you,or check your thermostat. after 20 years i still have to make sure tat i dont install it upside down. which is easy to do if your in a hurry. my bet is that the wiring going to the coolant sensor has a bare spot and grounding somewhere.

Posted on May 02, 2010

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