Question about 1996 Jeep Cherokee Sport

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My 1996 Jeep Cherokee 4L 6CYL heater stops blowing and defroster starts blowing when the engine is under load. Let off the gas and the heater starts blowing again. I think it miught be a vacuum leak... Any idea how to track the problem down?

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  • ataliawa Feb 01, 2010

    Using the technique described above, I found a worn rubber nipple on one of the manifold vacuum hoses. I replaced it and it seemed to work fine idling and revving in the driveway. Headed for the mountains next weekend and will find out for sure.




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Vacuum leaks can be identified by spraying small amounts of carburetor cleaner around the vacuum lines/hoses & connections. Any area that sucks in the carb cleaner will cause the engine to idle slower for a few seconds. Spray sparingly & allow to dissipate/evaporate between spraying to prevent any possible fire danger. The problem you are describing could also be the vacuum resivoir having a crack in it, it usuall stores enough vacuum to allow acceleration without affecting the heater controls as yours are being affected. this is usually a cannister or a black plastic mounted ball shaped device that has vacuum line(s) leading to them located on the fenderwells. good luck

Posted on Jan 30, 2010

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