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79 GMC C3500 overheating

Tiny
SMURPHY85
  • MEMBER
  • 1979 GMC C3500
  • V8
  • 2WD
  • AUTOMATIC
I have a 79 GMC C3500 with a 454. The truck is overheating and I cant figure out why. I just replaced the radiator with a new 4 row, burped the system and topped off the fluid. The thermostat is 4 weeks old and I tested it. It still wors fine. The water pump is still good, not cracked or leaking. The fan is working strong. Any ideas?
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Sunday, December 12th, 2010 AT 3:21 AM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Are you using any coolant, have you tested the radiator cap?

Mark (mhpautos)
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Sunday, December 12th, 2010 AT 4:00 AM
Tiny
SMURPHY85
  • MEMBER
  • 2 POSTS
Yes Im using coolant and the radiator cap is fine. Its not leeking radiator fluid anywhere
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Sunday, December 12th, 2010 AT 4:27 AM
Tiny
MHPAUTOS
  • MECHANIC
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You will have to get a head check done, this will check for a head problem.

Mark (mhpautos)
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Sunday, December 12th, 2010 AT 6:24 AM

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