1986 GMC C3500

1986 GMC C3500
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ROBINB
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  • 1 POST
Engine Cooling problem
1986 GMC C3500 V8 Four Wheel Drive Automatic
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HAS FLEX FAN WITH CLUTCH.AT FREEWAY SPEEDS FUNS HOTER THEN DRIVING SPEEDS.IS FLEX FAN OPENING UP.SHOULD I REPLACE WITH ORIGINAL I BELIEVE ITS A 6 OR 7 BLADE FAN BLADE?THANKS
Sep 14, 2008 at 12:34 AM
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BLACKOP555
  • ✓ASE Certified Mechanic
  • 10,386 POSTS
  • ASE Certified Mechanic
at those speeds a fan should have nothing to do with the vehicle overheating, it will show up as a issue at low speeds and idling.

i would check the exhaust mixture for excessive lean and bad ignition timing first.

hows the coolant level, does it stay full or does it go down on a regular basis?
Sep 14, 2008 at 4:38 PM
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