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post #1 of (permalink) Old 01-09-2008, 12:38 PM
300shortmag
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I am working on a 2003 impala. heater only works sometimes when the switch is...

...played with. No vaccume leaks? The fan blows, but it just blows cold air. I have checked vaccume lines, and they are all on tight. I don't here or feel any leaks. I'm not sure what they do when it is not working. As soon as I start fiddling with the hot cold switch and the vaccume lines, it starts working. I worked on another one that was doing somthing similar, and It got sent to our other shop and had a body control module put on it. I work for a school district, and only one of our shops has a computer to program the module. Our head mechanic did the the work, but he has quit. Does it sound like it could be the same thing, or somthing differernt.
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post #2 of (permalink) Old 01-09-2008, 12:39 PM
campmano
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sounds like a temp door actuator, my 88 chrys. heater would work great until it was really cold outside. when i turned the heat temp down it would work fine. but it would not get hotter when i turned it back up. only cold air.
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