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1992 Dodge Ram Van B350 Question: Why does my air conditioner blow hot air under load and blows cold when not?

 

Question

eddboy, Athens, MI, July 12, 2012, 22:38
 Rookie

While driving, the air conditioner blows cold air, but when I go up a hill or step on the gas the fan blows out hot air. Is there a vaccuum leak? If so, how can I find it?

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  • Answer #1

    Greg's Orange Auto (12947 Answers) , Orange, CA - (714) 361-9386
    globalhelper July 13, 2012, 06:02
     Master

    ck freon level and pressure you may have a restriction causing high pressure at cruize

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  • Answer #2

    pushrod July 13, 2012, 17:01
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     Master

    Sounds like a vacuum leak.See if air is switching to defrost when going uphill.If so there is a vacuum problem.
    Look under hood vacuum tubing is small plastic and looks almost like a wire.Look around with a light and
    check to see if tubing cracked broken unhooked ect.

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