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#1
10-23-2009, 01:33 PM
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95 Grand Prix cooling fan problem.
1995 GP SE 3.1, fan number 2 will not activate. Checked and swapped relays, no change. Checked fuses, all ok. Checked fan motor, ok. checked with car running, AC on full, no 2nd fan. Fan number 1 works fine. Any thoughts?
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#2
10-23-2009, 02:41 PM
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Re: 95 Grand Prix cooling fan problem.
I think 1 fan turns on at a certain temp, and the other fan turns on when the temp is higher. I am not sure what the temps are though.
As a test you can unplug the coolant temp sensor and then start the car to see if both will run. If the PCM loses the temperature signal, it commands both fans on to keep the motor from overheating. If only one fan runs, I would suspect maybe the fan driver circuit internal to the PCM is at fault.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#4
10-23-2009, 04:53 PM
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Re: 95 Grand Prix cooling fan problem.
Because both fans came on, wouldn't that lend itself more to a bad temp sensor?
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  2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl.
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#5
10-24-2009, 12:46 AM
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Re: 95 Grand Prix cooling fan problem.
good call, does the temp guage work?
But I think your car might just not be getting warm enough to kick the second fan on. Why are you worried? Did your car overheat?
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#6
10-26-2009, 08:51 AM
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Re: 95 Grand Prix cooling fan problem.
I agree with Tim. The second fan will only come on if engine temp exceeds 235 degrees. It should come on when the AC is set to max and ambient outside temps are above a certain temp (sorry, I don't know what that exact temp is, but I believe it's above 80), but it won't if the AC is just on normal settings or outside temps are below the PCM programming threshold.
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 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#8
11-11-2009, 05:49 PM
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Re: 95 Grand Prix cooling fan problem.
No problems!
Come back again with any of your questions!
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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