Question about 2000 Buick LeSabre

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AC blows cool air on passenger side but warm on driver's

Non-functioning AC system was recharged the system but is only partially working. It now blows semi-cool air on the passenger side but warm on the driver's. When set on normal it sounds ok but on max it sounds restricted. Is there a door or flapper in the duct that is stuck?

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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.

Posted on Jun 17, 2009

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Why is it blowing warm on and off on the driver side and blowing cool on the passenger side?


Here's is a little background and a couple of thoughts. Turning to the background, first. The heater/air conditioner system in your 02 uses the same set of ducts located in the instrument panel. In turn, those ducts are linked to what can be considered miniature version of the cooling system in the engine compartment (yes, this is a greatly simplified version). The whole system, in fact, is run off the main heater/ac system, however, it has a separate series of controls so that it can function properly.

When you dial a temperature, a signal is sent to the heater/cooling system telling the system to open a series of baffles, directing a flow of heated or cooled anti-freeze/coolant to the proper "radiator" behind the face of the instrument panel. In turn, the fan system activates a series of doors behind the instrument panel so that the flow of air is directed through the "radiator" and into the passenger compartment. This is essentially the heater/cooling system work.

Now, you say that the driver's side is hot, while the passenger side is cool. What has happened is that the flow of heated coolant that is supposed to heat the passenger side of the duct system is blocked. Since there is no heat to warm the air that is flowing past the fins of the "radiator," the flowing air remains cool to cold, depending on the weather and ambient temperature. The result is that one side of the car remains cool. And, since the other side of the "radiator" is normal and the air is heated, it is warmed.

That is the most likely explanation for this.

Another possibility is that the baffles themselves are stuck and the coolant that is supposed to be directed to the passenger side is not being directed their.

Either way, your technician has some work ahead.

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Sounds like you may have a leak in the A/C system. This can be easily tested by a certified mechanic and usually for a small fee. If it is not blowing at all, then the blower motor may need replaced, however, check all fuses and relays for the A/C system first. If it's blowing air, but the air is not cold, then you may just need to recharge your system. You can do this yourself by purchasing A/C refill cartridges at a local auto parts dealer. Some representative may be allowed to do this for you; inquire with the representative. It is recommended, however that a profession (certified) A/C mechanic does this.
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