MKOTZE
10-09-2002, 07:25 PM
Hi Bobby and welcome to the forum. Your question about the Ac only blowing cold air out of the defrost and floor ducts and not changing over to the dash ducts. This is a normal effect if the ac control system looses main vacuum.It was designed at the factory to revert to defrost and floor ducts if vacuum is lost. So, it is a good possibility that this is your problem. The first place to look is under the hood at the engine there is a physical vacuum line that runs from the intake manifold to the inside of the dash. On this model the factory used a plastic pipe that is affected by the changes in temperature and eventually starts to break. You should be able to see if this is broken.Let me know how it looks and we can go from there. Good luck. :chevy: MKOTZE