1987 GTA driver side fan problem
09-12-2014, 01:01 AM
#1
1987 GTA driver side fan problem
Hello
I have 1987 Pontiac Trans Am GTA with the L98 350 engine. My problem is, that the left fan (driver side fan) starts to running very early after a few minutes while driving (at 160 F or lower) and won't shut off until i turn the engine off. Before one month everything was fine. This week I changed the ECM, fan switch and relai. But no success...
Does anyone have an idea? Thank you.
I have 1987 Pontiac Trans Am GTA with the L98 350 engine. My problem is, that the left fan (driver side fan) starts to running very early after a few minutes while driving (at 160 F or lower) and won't shut off until i turn the engine off. Before one month everything was fine. This week I changed the ECM, fan switch and relai. But no success...
Does anyone have an idea? Thank you.
09-17-2014, 05:45 PM
#2
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Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Re: 1987 GTA driver side fan problem
You may have a bad coolant temperature sensor (front of intake base next to thermo-time switch) showing ecm incorrect temp. Presumably there is no check engine light ?
09-18-2014, 12:56 AM
#3
Re: 1987 GTA driver side fan problem
I changed also the temperature sensor in front of the intake. (original AD-Delco part) the results are the same. there is no check engine light.
09-18-2014, 06:52 PM
#4
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Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Re: 1987 GTA driver side fan problem
Does the fan come back on immediately if you turn the car off, then back on?
As a bit dumber question, does the CEL work ?
As a bit dumber question, does the CEL work ?
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09-20-2014, 08:46 PM
#8
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Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Re: 1987 GTA driver side fan problem
The secondary fan on an 87 is mostly useless unless you change to a lower temp fan switch.
My guess, if your a/c worked, was going to be the a/c fan request switch failing. A/C pressure rose to open the bad switch when engine bay temps got hot (exhaust manifolds) enough.
May be an issue that has to be scanned to see what is prompting the fan to come on so early.
My guess, if your a/c worked, was going to be the a/c fan request switch failing. A/C pressure rose to open the bad switch when engine bay temps got hot (exhaust manifolds) enough.
May be an issue that has to be scanned to see what is prompting the fan to come on so early.
09-29-2014, 05:55 AM
#10
Re: 1987 GTA driver side fan problem
News from my side: When I drive a longer distance (about 15 miles and more) then suddenly the fan is stopping an everything is as it should be. It kick on at the intendend temperature. But the problem is: When the car is cold again, fan runs again...
05-08-2015, 01:43 AM
#11
Re: 1987 GTA driver side fan problem
Still have the problem. Primary fan is still on when i start the cold engine. The A/C don't works.
Can it be the a/c switch? I changed the relais, ECM, fan switch - no reason.
Thank you for some suggestions.
Can it be the a/c switch? I changed the relais, ECM, fan switch - no reason.
Thank you for some suggestions.
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