79 GMC C3500 overheating

1979 GMC C3500
V8 • 2WD • AUTOMATIC
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SMURPHY85
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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?
Dec 12, 2010 at 3:21 AM
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MHPAUTOS
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Are you using any coolant, have you tested the radiator cap?

mark (mhpautos)
Dec 12, 2010 at 4:00 AM
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SMURPHY85
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Yes Im using coolant and the radiator cap is fine. Its not leeking radiator fluid anywhere
Dec 12, 2010 at 4:27 AM
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MHPAUTOS
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You will have to get a head check done, this will check for a head problem.

mark (mhpautos)
Dec 12, 2010 at 6:24 AM