Question about Pontiac Firebird

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I have a 94 firebird with a 3.4, and the coolant fan wont come on all the time. I have replaced the relay, and the sensor that sends info to the computer, but its not getting better. What do you think the problem is ?

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  • Pontiac Master
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Change the thermostat,and bleed all the air from the coolant system,the sensor has to have coolant to contact with,not steam,or hot air pockets,it will not sense this,so you see it has to have coolant on it at all times to make it sense the actual temp.

Posted on May 28, 2010

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Posted on Jan 02, 2017

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Coolant fan control switch at 238 degrees closes an supply's a ground for the cooling fan relay ,their by energizing the relay an closing the contacts sending B+ voltage to the cooling fan Or the PCM does ,depends on which engine . There is a fusible link that supply's B+ voltage for the fan it's self . A fuse for the control side of the relay . Did you use a DMM - digital multi-meter an test B+ power circuit's & ground circuit's . Maybe your best bet would be to take it to a qualified repair shop .

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Does the temperature gauge on your dash work okay?

The coolant temperature sensor provides a signal to the PCM to tell it when to turn the fans on and if its a three wire coolant sensor it also feeds the signal to the gauge on your dash and if the gauge on your dash is not working, it could be a clear sign that the sensor is dead.

However, to start with the simple things, first check the fuses that power the fans, it will be a large fuse probably in the under the hood fuse box and maybe in the 30A range. Check the fan relays as well.

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