Help with cooling fans
Thread Starter
Teching In
Joined: Oct 2018
Posts: 23
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Help with cooling fans On my 99 firebird, only one of my cooling fans is coming on. Its causing my temp gauge to go up when im idling for a few minutes at a stop light or traffic. It does fine when im moving. What could cause only one fan to work and not the other?
TECH Senior Member
Joined: Jun 2016
Posts: 22,308
Likes: 3,625
From: Central Cal.
Check ALL connections AND grounds, plus the relays that actuate the fans. If the both fans normally ALWAYS came on at the same time, then one fan is bad. But if they come on in a staggered order, you'll have to check the whole system out.
TECH Resident
Joined: Apr 2014
Posts: 985
Likes: 12
Don't mind this guy, he thinks this is his site, kinda like a mall security guy, you know a wannabe. Wait for his comeback, that will tell you something.
Check and make sure you have power and ground at the connection on the fans, simple test light will do, unplug connector at the fans, to check for power put the test light on the
ground side of the battery, and turn the a/c on so the fans will have a signal, then see if you have power.
and to check for ground put test light on positive side of battery and see if there is ground again a/c on as well as ignition. Do that on both fans, if you have power and ground
then you have bad fan motor, if not check the fan relays.
If you haven't found the issue yet, get wiring schematics and go from the fan motors back see the last place you have power. Good Luck
Check and make sure you have power and ground at the connection on the fans, simple test light will do, unplug connector at the fans, to check for power put the test light on the
ground side of the battery, and turn the a/c on so the fans will have a signal, then see if you have power.
and to check for ground put test light on positive side of battery and see if there is ground again a/c on as well as ignition. Do that on both fans, if you have power and ground
then you have bad fan motor, if not check the fan relays.
If you haven't found the issue yet, get wiring schematics and go from the fan motors back see the last place you have power. Good Luck
TECH Senior Member
Joined: Jun 2016
Posts: 22,308
Likes: 3,625
From: Central Cal.
Don't mind this guy, he thinks this is his site, kinda like a mall security guy, you know a wannabe. Wait for his comeback, that will tell you something.
Check and make sure you have power and ground at the connection on the fans, simple test light will do, unplug connector at the fans, to check for power put the test light on the
ground side of the battery, and turn the a/c on so the fans will have a signal, then see if you have power.
and to check for ground put test light on positive side of battery and see if there is ground again a/c on as well as ignition. Do that on both fans, if you have power and ground
then you have bad fan motor, if not check the fan relays.
If you haven't found the issue yet, get wiring schematics and go from the fan motors back see the last place you have power. Good Luck
Check and make sure you have power and ground at the connection on the fans, simple test light will do, unplug connector at the fans, to check for power put the test light on the
ground side of the battery, and turn the a/c on so the fans will have a signal, then see if you have power.
and to check for ground put test light on positive side of battery and see if there is ground again a/c on as well as ignition. Do that on both fans, if you have power and ground
then you have bad fan motor, if not check the fan relays.
If you haven't found the issue yet, get wiring schematics and go from the fan motors back see the last place you have power. Good Luck
You and 8.Lug ought to hook up; you both have so much in common...
Last edited by G Atsma; Oct 8, 2018 at 12:38 PM.
