custom hi/lo radiator fan override 92-93 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-28-2004, 12:14 AM   #1
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Default custom hi/lo radiator fan override 92-93

I've saw post about a fan overide. Moslty for the 95-96'*. What about the 92 - 93'* ?
Will, I saw you have the fan overide. Is it manual ? Did you just install a switch ? or is it thermostatically controlled ? Can I fool the PCM someway and get those fans to turn on sooner ? I think the stock fans come on at like 225 or something ... I can just about hear my engine baking at that temp. I'm having a hard time finding a chip to turn them on sooner. My first call to Jet wasn't very successfull.

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Old 09-28-2004, 12:17 AM   #2
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http://www.bonnevilleclub.com/forum/...hlight=cooling

And the PCM doesn't control the fan turnon. At least not on a 93. There'* a thermocouple mounted on one of the fans
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Old 09-28-2004, 12:22 AM   #3
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Quote:
The PCM actually watches the low speed fan relay for the proper voltage.
Im confused. The PCM does not turn on the fans ? A thermocoupler does ?
How does it know to go from high to low ?

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Old 09-28-2004, 12:24 AM   #4
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I think the PCM does turn them on based upon engine coolant temperature.
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Old 09-28-2004, 12:26 AM   #5
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According to the 93 FSM which I don't have right in front of me, the fans come on lo-speed at a set temp based on the input to the PCM from the thermocouple on the driver'* side fan.

Any time the AC compressor is on, the fans are both Hi-speed. There may be other conditions for fan turn on as well. Someone double-check me on this.
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Old 09-28-2004, 12:33 AM   #6
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So, if I'm reading this right. I could install a resistor at the thermocoupler to make the PCM believe it is hotter than it actually is ? I may get an adjsutable resistor and wire it up and see what happens.


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Old 09-28-2004, 12:35 AM   #7
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OK, willwren, let me make it easy on you. Grab the FSM, Volume 2, page 6E3-C12-1.

You are probably mistaking a thermocouple for a resistor.

Any questions?
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Old 09-28-2004, 12:35 AM   #8
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Need clarification. DrJay has my FSM'*. I'll send him in here.
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Old 09-28-2004, 12:36 AM   #9
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There ain't no thermocouple!
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Old 09-28-2004, 12:40 AM   #10
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OK... it works off the temp sensor then ? I got the FSM'*. I see the resistor symbol ....
I just think I can go to Radio Shack and get a 1\2 ohm resistor wire it in .. and badda bing .. I got fans that turn on at a lower temp. Then again .. it may melt.

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