K1500 350 overheating

HATOM

MEMBER
1995 CHEVROLET CHEYENNE
V8
4WD
MANUAL
160,000 MILES

1995 chevy k1500 with 350 and five speed manual trans. 4x4. Overheating when in 4wheel drive at higher speeds. Pull over and idle and it cools down. Not consuming coolant. Can't tell if fan is working. Where would you start?

Wednesday, December 22nd, 2010 AT 10:16 PM

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Double check the cooling fan if its coming On -if so start at the thermostat-

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Wednesday, December 22nd, 2010 AT 10:28 PM

HATOM

MEMBER
4 POSTS

Those are the two areas that I thought about. How do I determine if the fan is operating correctly? When at idle it is turning at a constant slow speed. Rev. It up and it does not appear that it increases in speed. Never hear it kick in even when it gets like 250 degrees. I have only approached that temp a couple of times and then I immediately pulled over and it cools down rapidly at idle.

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Wednesday, December 22nd, 2010 AT 10:47 PM

RASMATAZ

MECHANIC
75,992 POSTS

You sure this is not a fan clutch cooling system sounds like fan clutch problem-

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Thursday, December 23rd, 2010 AT 12:40 AM

HATOM

MEMBER
4 POSTS

Thank You very much for the help. Went out today and purchased heavy duty fan clutch and thermostat. Put the fan clutch on first and test drove and that solved the problem. Went ahead and put in the new thermostat anyway as that is a pretty easy job. Working fine. Good Job.

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Thursday, December 23rd, 2010 AT 9:10 PM