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post #1 of 5 Old 11-24-2013, 05:29 AM Thread Starter
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Wj Help me please.

OK i have a 2003 WJ and my heat turns on and blows hot air but it wont change from defrost to anything else. and also when i turn the dial from high to low the back light well be off i turn it on and off again and the light comes back on not sure if that's part of the problem or not. at one time i would hammer down on the gas pedal and then let off and it would start to blow air out of the vents so im thinking its a vacuum problem not to sure. also it started doing it after i took it to jeep dealership to get a cam job done so im not to sure if they did something to it or not. its starting to get cold so i need to figure this out. i hope someone can help me thanks..

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post #2 of 5 Old 11-24-2013, 05:44 AM
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What engine do you have? I had the 4.0 and this happened to me once. It is probably a vacuum hose off of the eng. On the 4.0 look on the drivers side of the eng at the intake manifold about the middle of the eng (around the 3 or 4 cylinder area). That is where I found my problem. You might be able start it up and hear a sucking sound. If not there then check all around and even under the dash for a vacuum line that is either off or broke/cracked.

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post #3 of 5 Old 11-24-2013, 06:39 AM Thread Starter
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i have a 4.0. and thanks for the help i will check it in the morning!
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post #4 of 5 Old 11-24-2013, 12:26 PM
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Definitely a vacuum leak. The lighting is a separate issue.

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post #5 of 5 Old 11-24-2013, 10:08 PM Thread Starter
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so i checked around the eng and didnt see anything that looked out of place. gonna have a buddy help me look into it more tomorrow i dont know to much about cars
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