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  1. #1

    Exclamation Over heating!help!

    What up guys....So I have a 2002 Chevy Silverado 5.3L.and I having over heating problems....but just when the truck isn't in motion and when the a/c is on....but when the a/c isn't on it's fine no over heating....also ive notice when the truck isn't in motion the a/c isn't cold its hot...mmmm well warm I would say then when the truck is in motion then the a/c is cold why is that?what's wrong with it?how can I fix it?Help please.
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  2. #2


    I am no expert, but just speaking to the physics of the issue it is simply an air flow problem. When not in motion there is not enough air moving past the AC cooler to properly cool the refrigerant. This also causes additional heat to remain near the vehicles radiator, not to mention the added load the AC contributes to the engine. How to fix it? Just don't stop, drive fast

  3. #3


    Along the lines of johnsonfarms comment, two things I'd first check: 1) anything obstructing airflow through the radiator (leaves, dirt, bugs, etc.) and 2) fan clutch could be worn.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  4. #4


    X2 what MrShorty said.

    2005 Chevy Silverado Z71 Crew Cab
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    One black Lab in rear seat.

  5. #5
    stephan's Avatar
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    When you're cleaning your AC condenser & radiator of the bugs & dirt, be sure & wash them out from the rear to the front. They went in the front, so that's the way they have to come out. If you just spray them from the front, you will just wedge them farther in & you'll never get them out. Mix some soapy water in a spray bottle & spay the condenser & rad & let it sit for 30 minutes. Then take the garden hose & wash them out from the rear foreward.
    1988 Chevy C-3500 2wd (no pic)
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