I had a similar experience with my car. This can be annoying during the summer months. I think you would just need to change the filter, which a mechanic could help you do. http://www.WintersHVAC.com
Temperature Variation Between Driver and Passenger Outlets ! You don't just replace parts , you have to hook up a scan tool !
Does the scan tool display any DTCs?
You could have a air temperature sensors problem !
Air Temperature Sensor Replacement - Upper Right Side
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Air Temperature Sensor Replacement - Upper Left Side
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Air Temperature Sensor Replacement - Lower Left Side
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Air Temperature Sensor Replacement - Lower Right Side
Here are just a couple DTC'S that could be stored !
0126
Air Flow Position Command Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0131
Air Flow Position Feedback Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0159
Outside Air Temperature Sensor Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0164
Passenger Compartment Temp Sensor Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0174
Output Air Temperature Sensor Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0179
Output Air Temperature Sensor 2 (lower or left) Circuit Range/Performance
HVAC Control Module
DTC B0126, B0131, B0159, B0164, B0174, or B0179 in HVAC Systems - Automatic
B0184
Solar Load Sensor 1 Left Circuit Range/Performance
HVAC Control Module
DTC B0184 or B0189 in HVAC Systems - Automatic
B0189
Solar Load Sensor 2 Right Circuit Range/Performance
HVAC Control Module
DTC B0184 or B0189 in HVAC Systems - Automatic
B0234
Air Flow Control (general or single control) Circuit Range/Performance
HVAC Control Module
DTC B0234, B0249, B0269, or B0279 in HVAC Systems - Automatic
B0237
Air Flow Control (general or single control) Circuit Open
HVAC Control Module
DTC B0237, B0252, B0272, or B0282 in HVAC Systems - Automatic
B0249
Air Flow Control 3 (blend defog and floor) Circuit Range/Performance
HVAC Control Module
DTC B0234, B0249, B0269, or B0279 in HVAC Systems - Automatic
B0252
Air Flow Control 3 (blend defog and floor) Circuit Open
HVAC Control Module
DTC B0237, B0252, B0272, or B0282 in HVAC Systems - Automatic
B0269
Air Flow Control 7 (recirculate) Circuit Range/Performance
HVAC Control Module
DTC B0234, B0249, B0269, or B0279 in HVAC Systems - Automatic
B0272
Air Flow Control 7 (recirculate) Circuit Open
HVAC Control Module
The point being this is a very complex system an to diagnose the problem you need the proper tools ! Your best bet is to take it to the dealer or some other ASE certified repair shop !
Sounds like you have a temp door motor problem on the drivers side. the motors seize/stick and have to be replaced.
SOURCE: 2000 buick lesabre 3800 has
I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!
SOURCE: Only cold air on passenger side
I would first check and make sure that you have enough Freon in the system, on climate control dual systems only one side will put out cold air if the system is low on Freon. Eventually, both sides will put out warm/hot air if the system continues to loose Freon. As with all leaks the system should be checked and then the leak causing component replaced/repaired.
SOURCE: air conditioning in 2000 lesaber
Vent door between the two sides isn't opening or the flex hose going between the two is off.
SOURCE: AC blows cool air on passenger side but warm on driver's
Yes there is both a door and a flapper you have a problem with a blend door motor, it is not switching to cold it is half open and half closed so you need to replace the motor vacuum motor it is under the dash near the heater on the passenger side and if it is the other motor under dash you will have to take part of the dash apart to get to it, to test buy a piece of vacuum hose 1/8 inch diameter about 3 feet long and you can hook it to each of the vacuum motors and **** on the end of the line to see which one is causing you the problem, also could be the control head for the AC inside the car where the controls are, you have to remove the ac cluster ot get to the vacuum switch it's all vacuum operated and if you pull it out you will be able to here an audible sound of air leaking if it's the switch.
SOURCE: Blows warm air on drivers side, cold on passenger side
Hello,I work on these cars and have issues w/ this in the past.The Buick uses the same evap core as the cadillacs and are considered a (split design),and are true dual hvac system.That being said I have found a slighty low ac fren charge can and dose cause this condition.If the ac has been charged then the issue can be a blend door actuator.This can be found behind the glove box (small black box w/ 4 or 5 wires going into it)held in place w/ 2 or 3 ,5.5mm screws. try to have the ac recharged first and see what happens. Have a great day! RAY
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