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1991 firebird cooling fan will not turn on. I have replaced both sensors. Both relays

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Posted on Jan 02, 2017

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SOURCE: cooling fan not working

The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.

Posted on Aug 22, 2008

  • 702 Answers

SOURCE: Cooling fan wont work

The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Posted on Sep 27, 2008

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SOURCE: 2000 cavalier 2.2L cooling fan will not come on

after you check the grond in the fan conector and all the fuses i can say its coolent temp sensor.

Posted on Mar 14, 2009

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SOURCE: cooling fan wont turn on on my 2000 grand am

are you having a temperature problem? i heard that the cooling fans only come on at high temperatures, around 230F.

Posted on Jun 16, 2009

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1 Answer

95 firebird the cooling fan wont come on unless I unplug the fan sensor then it comes and cools the car right down

The fan relay is grounded by the computer (ECM) so you need to test that pin on the ECM connector. When you unplug the ECT sensor you send it into default that is why it runs. Please keep in mind that the fan is not activated until the engine reaches 220F-225F that is well passed the middle of the temperature gage scale . Make sure you really have a problem.

Nov 11, 2016 | 1995 Pontiac Firebird

1 Answer

What sensors are bypassed when the cooling fan is put on a fusible link on 89 firebird

I'm not sure I completely understand your question, if youre wiring the cooling fan directly to power (with the fusible link) you'll be bypassing the PCM's output to the fan relay...the PCM uses the Coolant temp sensor (CTS) as an input to determine when to turn the fan on.

Jun 17, 2015 | 1989 Pontiac Firebird

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2001 pontiace firebird Disconnected negative

Are you getting a ground signal from the engine computer to turn the fan relays on ?
The computer grounds the relay when the engine temp reaches 220 degrees, or when the ac compressor is running.

Aug 27, 2013 | Cars & Trucks

4 Answers

Why won't the fan motor shut off on my 1991 acura legend?

Hey chandralebea,

Try first by replacing the cooling fan engine temp sensor switch, as this may be the cause.

Good Luck

Jul 29, 2012 | 1991 Acura Legend

1 Answer

Cooling fan problem on 1992 pontica firebird

The cooling fan switch is built into the ECM. The ECM tells the fan to turn on at about 220 degrees. If you have a bad coolant temp sensor you might have trouble there. Usualy I find the relay or fan motor to be the problem. In some cases the ECM or CTS is the problem. I hope this helps.
Thank You,

Aug 09, 2009 | 1992 Chevrolet Camaro

2 Answers

Fans arent working on. checked fuse

Check cooling fan relay beside master cylinder on firewall.

Jun 11, 2009 | 1994 Pontiac Firebird

1 Answer

02 firebird cooling fans not working.

either the relays are bad or fan motors are shot. You can connect wires directly to battery power to determine if it is relay or fan motors. Most likely relay since car is fairly new. Also change that temp sensor is shot but I doubt it. Check engine light would be on.
So this brings me back to the fan relay.
You can view a free online repair manual and free registration at

May 15, 2009 | 1987 Pontiac Firebird

1 Answer

Coolant fan

3 things to check, 1st, temp switch (controls turning fan on and off according to eng. temp, 2. cooling fan control, tells switch when to turn on and off, and 3. fan motor. Check it to make sure it isn't shot.

May 05, 2009 | 1999 Pontiac Firebird

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