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92 Buick Park Ave Heater Control Air from Defroster and floor all the time

Anyone have any ideas? air comes from the floor and defroster all the time regardless of selection. Everything appears to work normally. This car has electronic controls, and I have entered the diagnostic mode and found no fault codes, and any further troubleshooting thru the diagnostic mode it isn't much help without a book telling me what all those different numbers mean. Anyway I have checked the vacuum hoses and anything else I can get to and everything seems ok. Can anyone tell me what exactly control the air discharge. Thanks

Reply to
Mastermech
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There are actuators that cotrol the airflow in the heater core box/ electrical / mechanical. they may need to be replaced

Reply to
PallMall

I had the exact same problem with my '94 PA. I checked all of the vacuum hoses also, but it didn't solve the problem. Then, when I was changing the Master cylinder, I noticed the vacuum line that goes into the firewall to control the heater controls was partially connected (vacuum leak). The car never ran rough. I reconnected the vacuum line, and the controls started working again.

I also found this link to help out. I actually went to an auto-recycler and pulled out the vacuum manifold from another PA just in case. Never needed it. I have since sold the car. If you determine that the vacuum manifold on your PA is bad and want the one I have, let me know.

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Anyone have any ideas?

Reply to
William F. Yehle II

Thanks for the link William. That looks indeed like it may be my trouble, I will try to get in there and take a look this weekend and post back.

Reply to
Mastermech

FIXED IT!

Great link! Although my trouble wasn't from bad hoses it sent me in the right direction. Turns out that the vacuum hose you mentioned next to the master cylinder was connected but there wasn't any vacuum. The hose connects to a black plastic box. I opened it up and low and behold it was empty. Must be a vacuum accumulator. I sealed it up good reinstalled and presto. Good as new! Thanks again for the input.

Jeff

Reply to
Mastermech

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