GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER

Over heating!help!

Discussion in 'GM Powertrain' started by Edgar_505, Jul 25, 2011.

  1. Edgar_505

    Edgar_505 New Member

    Joined:
    Sep 24, 2009
    Messages:
    22
    Likes Received:
    0
    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.
    #1
  2. johnsonfarms

    johnsonfarms New Member

    Joined:
    Jul 25, 2011
    Messages:
    4
    Likes Received:
    0
    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 :)
    #2
  3. MrShorty

    MrShorty Moderator

    Joined:
    Jan 12, 2006
    Messages:
    1,368
    Likes Received:
    10
    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.
    #3
  4. silveradotrailblazer

    silveradotrailblazer New Member

    Joined:
    Dec 23, 2008
    Messages:
    7,291
    Likes Received:
    20
    X2 what MrShorty said.
    #4
  5. stephan

    stephan New Member

    Joined:
    Sep 28, 2010
    Messages:
    8,610
    Likes Received:
    14
    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.
    #5

Share This Page