Question about 2001 Jeep Grand Cherokee

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Air conditioner when under a load where vacumn is pulled the A/C blend turns hot for a couple of minutes andt then returns to cold air. Fan is not effected, just air temp

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  • John Congistre Jul 28, 2008

    Air blends shuts off under heavy load on engine. No vaccum??

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Has the car been in an accident? sounds like the vacuum canister is cracked or the line to it is bad. when you go up hills or accelerate then the vacuum canister maintains vacuum to hold the h.v.a.c. doors in place. if the vacuum drops them the air aill go warm and start blowing out at the windshield in the defrost position. We can thank the government for that. that is so if the vacuum to the h.v.a.c. is lost you should be able to clear the window no matter what conditions. since the vacuum from the engine "tees" into the harness you don't see the problem until under a load and the engine vacuum drops. Good luck

Posted on Aug 31, 2008

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