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Old 07-10-2000, 12:26 PM
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I have a 91 350 SDL 175,000 mi that I have had for 2 yrs with few problems. The car seems to run hot now if the AC is off. I understand that that could be the fan clutch not engaging at 100c or the fan clutch switch. I have purchased a new switch but cannot find where it goes (do I want to have a mechanic do it or can a do-it-yourselfer handle it)...Am I on the right track? Please help...thanks
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Old 07-10-2000, 10:13 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
If it is running warm without the fan on, I would have to assume it is bacause of the lack of the auxillary fan. Therefore, I would think that the thermostat, or fan, or radiator could be at fault. Without the a/c fan on, the engine should not need the help of the auxillary fans to keep cool.

Donnie Drummonds
1991 GMC Syclone
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Old 07-11-2000, 09:46 AM
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The car only runs hot when it is over 80 degrees out with high humidity. If I drive on the highway, it cools down, if I drive with AC on it cools down. I explained the problem to a tech and he suggested that there is a switch that went bad (which I have an new one of and have not replaced yet). The part is a Cylinder that has a 1/2" screw in post on one side and 3 contacts on the other. Should I replace this? Is this something that I can do myself, or should I have it done? Where does it go? THANKS FOR YOUR HELP I APPRECIATE IT.

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Old 07-14-2000, 01:37 PM
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Join Date: Apr 1999
Location: Apex, NC USA
Posts: 176
Had the same problem with mine. For $50 I had the radiator flushed and the problem disappeared.

I beleive if you can check the fan itself by unplugging the sensor on the block the fan will run constantly.

Your fan clutch isn't electric. It's got fluid in it.

1991 350 SDL
114,000 miles
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