Heat/air won't switch from defrost..
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As the others stated, you have a vacuum leak. With lack of vacuum, the HVAC defaults to defrost. A very common failure point is the plastic vac line on the cruise control servo. You'll find it under the driver-side battery. Battery acid drips down directly on the line and eats a hole in it. Very hard to see, even when you are looking for it.......
Last edited by mrclean; 05-05-2012 at 05:28 PM.
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