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

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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?
(2) Answers
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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