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1986 GMC C3500

Tiny
ROBINB
  • MEMBER
  • 1986 GMC C3500
Engine Cooling problem
1986 GMC C3500 V8 Four Wheel Drive Automatic

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
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Sunday, September 14th, 2008 AT 12:34 AM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
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?
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Sunday, September 14th, 2008 AT 4:38 PM

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