1999 Buick Century Cold air Driver side/Warm air on Passengers side.
When I turn on the Climate control for heat, blend for dash and floor. I get cold air on driver side and warm air on passenger side. In park, I have raised the hood to check the a/c compressor. The clutch is engaged and running as though I requested a/c. I am handy fixing cars, but I do not have manual for this vehicle. Please, any ideas for a fix?
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May b a blend door issue..
If its electronic unit then maybe a actuator gone bad
If controlled by vacuum then a broken/loose hose
Does that side change from different settings(dash/floor/defrost even)= blend door issue usually
Some cars have two temperature controls one for the passengers compartment and one for the drivers compartment . You may have one turned to warm or the control for one may be defective On these cars with dual controls you have 2 Blend doors one of the blend doors may be defective.
It sounds like you have either a defective passenger blend air door actuator or a broken passenger blend air door.
Sometimes the actuators just get stuck. Try turning the passenger control to full COLD and wait about 1 minute. Then turn it to full HOT and see if it changes. I have done this with several GM vehicles and I often get a "POP" noise when I change it back to HOT and everything starts working again. I have also had some luck getting stuck doors loose by removing the hush panel from under the dash and "thumping" on the A/C housing with my fist.
If none of this works, you will have to remove the dash to fix it.
if this has dual climate controls then the drivers side blend door actuator is not working properly. if it is only single climate control then a low freon level can cause the air on the driver's side to be warmer.
You need to replace the "blend" door actuator motor on the pass side. I recommend getting that from your nearest gm dealer to ensure proper fit. When you adjust the air from cold to warm to hot, the blend door moves to direct the right amount of cold, or warm, or hot air your desire on that side of the vehicle