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1999 Chevy Astro Van When you turn on your heater and try to change the position were the heat comes from it will not move It is always coming out from the defrost ducts and will not move to other are?
Wiki User
∙ 15y ago
The position that the heat comes out of is vacuum controlled. I have fixed this on my 99 a few times. There is a small diameter plastic vacuum line that goes from the drivers side engine valve cover, near the front, over top of the engine to the HVAC area under the hood on the passenger side. This line cracks or breaks with age. I think it is from the heat of the engine. Once you have a big enough vacuum leak the heater position control stops working. The last time I fixed it I replaced the plastic line with a piece of rubber vacuum line and it has worked out pretty well. Good Luck.
Wiki User
∙ 15y ago
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