My 1996 Buick Park Ave, when the air conditioning is selected the passenger side blows heated air, I believe it is something to do with the climate contol control that is on the passenger side door! If so can that be bypassed?
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Are you able to control the driver side air temperature at the dash registers? If not and you can control the passenger side of the dual climate system then you have an issue with the air temperature control door (moves between the heater core heated air and the AC evaporator cold air stream) deep inside the dash or the electric actuator that moves it or in most cases both.
Is this with the air conditioner running? Does this have dual controls? If you have dual controls and this is with A/C running, your system is under charged. There is no easy fix if mode control valve is bad. First step is disable air bag. Second step is completely remove the dash. Good Luck!
Sounds like you might have blown the BM unit. As far as the vent selection goes, I worked on a Buick LeSabre a few years ago with the same kind of trouble. There is a vacuum distribution block down under the glove compartment that directs the route air goes. It is notoriously trouble. In my case the block was poorly formed. Sometimes the vacuum connections on the block are plugged, sometimes they crack or break off. Unless you are a full blown Mr Fixit you just need to replace the block.
i just bought a 98 park ave and i had the iossue of hot on passenger side and cold out the driv ers i was told i had to replace the control head and both accuators...... i did a trani flush and it fixe my problem
think the heater core is partialy blocked ,drain coolant antifreeze and fill with water then add some caustic soda say a half a cupfull then run car for a day or two till the heater starts blowing hot then give a good flush and refill with the antifreeze ,cant say it will work but their is a good chance it will work
Behind the glove box you will see the heater box. On top of the heater box you will see a set of wires going to a small controller box that has an arm on it. It is probably not working and you can only by them at the dealer. It is the dual climate controller and cost approx. $100.
sounds like the drivers temp door actuator is not working should be located on the drivers side of the air box down by the gas pedal or center dash area
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