Cooling fan
#1
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Car: Trans Am GTA -91
Engine: 350 Tpi
Cooling fan
1991 350 tpi / when i took out the car from winter storage i noticed that the coolingfan on the passenger side turns on as soon as i turn on the ignition.
Everything is original and untouched. Ac doesnt work because it needs charge. Any ideas what could be the problem? Havent tested anything yet but will try switching too the relay that controls the fan on the drivers side. Sorry about the spelling. I am from sweden.
/ Thanks. Per
Everything is original and untouched. Ac doesnt work because it needs charge. Any ideas what could be the problem? Havent tested anything yet but will try switching too the relay that controls the fan on the drivers side. Sorry about the spelling. I am from sweden.
/ Thanks. Per
#2
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Car: 90 Formula / T-tops
Engine: 305 TPI
Transmission: MD8
Re: Cooling fan
I think it is designed to do that when something fails, but I forget what will fail to cause that. perhaps a sensor came unplugged. maybe something to do with a/c, but just turn a/c request off at control panel, and see if it still turns on right away.
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Car: Trans Am GTA -91
Engine: 350 Tpi
Re: Cooling fan
I have now tried switching the relays fan1 and fan 2, and turned a/c request off at control panel.i have also disconnected the switch on the condenser. The fan still runns as soon as i turn on the ignition. If i understand things right the tempsensor on the passengerside in the block also controls the fan. I will try disconnecting it when i can get the car up on the lift. How do i measure the sender? Resistans givs a certain temp i think?
#5
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Car: '92 Corvette, '89 1/2-a-'Vette
Engine: LT1, L98
Transmission: ZF6, ZF6
Axle/Gears: 3.45, 3.31
Re: Cooling fan
I don't think that there is a temp switch or sensor in the block. There is one in the front of the intake, and one or maybe two, in the cylinder heads. You don't need a lift to get to any of them.
In some model years, a Check engine light on will trigger the ECM to command the fan on all the time.
In some model years, a Check engine light on will trigger the ECM to command the fan on all the time.
#6
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Car: 1991 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3:42 Auburn
Re: Cooling fan
If you can, you should order this one from hawks
You don't need a lift, just a jack and stands will do and you will see it from underneath, coming out of the cylinder head just in front of the starter
#7
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Car: 1991 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3:42 Auburn
Re: Cooling fan
IIRC these work on wax melting to somehow complete the ground circut of the fan. Not sure if there is a resistor test for that. You should be able to test it by turning the ignition on so that pass fan runs, of course do this with the car cold. While it's running pull the lead off the temp switch. If the fan stops your switch is grounding all the time and is bad.
Last edited by vinny R; 03-21-2024 at 12:54 PM.
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#13
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Car: '92 Corvette, '89 1/2-a-'Vette
Engine: LT1, L98
Transmission: ZF6, ZF6
Axle/Gears: 3.45, 3.31
Re: Cooling fan
I agree. But I also think that any sensor in the head is pretty easily accessible from under the hood. YMMV
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