Question about 1998 Pontiac Grand Prix
Turn the key on and unplug the coolant temp sensor to see if the fans will turn car does not need to be running. There should a few relays hi speed fan, lowspeed fan. It is also possible that the fan motors are bad as well. The different speeds are opertating at different voltages and when high speed kicks in enough voltage is supplied to power up the fan however the lowspeed may be requiring to much voltage to operate with in the fans parameter. Attached is your fan circuit wiring diagram If you remove the relays one at a time a run a jumper wire between terminals 87 and terminal 30 on the relay you should get the fans to come on. This should work with both relays but make sure to only try what at a time. The terminal numbers will be located on the relays. Pay close attention to the lowspeed relay because when you jump the high and it works but jumping the low does not it may be the actual fans.
Posted on Oct 09, 2010
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Posted on Jan 02, 2017
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