1990 chevy pickup 2500 - Over heating


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1990 chevy pickup 2500 - Over heating

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grantdismuke
New User

Jul 27, 2008, 7:01 PM

Post #1 of 5 (3697 views)

1990 chevy pickup 2500 - Over heating	Sign In

I own a 1990 Chevy 2500 pickup truck 2 wheel drive with a 5.7 gas engine, the truck over heat when you are driving up a medium grade hill, the water pump , thermostat has been replaced, what can cause it to run hot under these conditions?

thanks grant

Jeff Norfolk
Enthusiast
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Jul 27, 2008, 7:26 PM

Post #2 of 5 (3693 views)

Re: 1990 chevy pickup 2500 - Over heating	Sign In

Sound like either you are low on coolant or your radiator may be blocked. Run it till it is at opperating temp. Then shut it off. If the radiator is hot at the top and cold at the bottom then thats a good indication. Look around the and under the upper radiator hose on the radiator for signs of leaks. These style radiators are terrible about cracking there.
Jeff

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 28, 2008, 5:29 AM

Post #3 of 5 (3688 views)

Re: 1990 chevy pickup 2500 - Over heating	Sign In

Among other things a weak fan clutch could be the problem. They should be replaced about every 5 years on vehicles in hotter climates and under loads,

T

Guest
Anonymous Poster

Aug 20, 2008, 9:55 AM

Post #4 of 5 (3647 views)

Re: 1990 chevy pickup 2500 - Over heating	Sign In

did they sell u the proper water pump ? that year had both forward and reverse rotation

Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 20, 2008, 3:57 PM

Post #5 of 5 (3643 views)

Re: 1990 chevy pickup 2500 - Over heating	Sign In

Guest: That's an interesting point IF the problem BEGAN with a pump replacement as there are reverse directional pumps and some counter rotating engines - especially HD or special purpose as in marine use for the right hand of twin engined vessels which commonly use GM truck V8 blocks and others.

Hey - why not sign up and chose any "user name" you wish?

T

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