Hot air on driver side when air conditioner is on

punch47

only get hot air drivers side other side cold,

imidazol97

Low freon charge on some cars allows the air to stay warmer on the driver side--2000 and up Buick.

punch47

Thanks but added freon and no help, cold on passenger side hot air on driver side. Thanks

imidazol97

Do you know what year and model it is? Does it have dual temperature control?

punch47

It is a 2002 Buick LeSabre. It doesn't have dual temp control. When temp on hot air comes out both sides. Air conditioning only blows cold passenger side. Defroster is cold one side hot on driver side

imidazol97

I'm not quite sure if you are describing more than one symptom there, but the 2000+ H-bodies (Pontiac thru Cadillacs) are designed so that if the freon quantity is low, the part of the evaporator that has air going through it mostly to the passenger side gets cooled, but when the freon gets to the other part of the coil the liquid has already expanded into vapor and can't do any cooling on the air through that part of the coils. So the driver gets warm air.

A good test is if the system seems to work a little better on cool mornings with the AC on for driver and passenger at same temp if automatic temp controls, the system seems to give a little cooling to the driver side especially if the blower speed is on LOW. That puts as little demand on the freon on the driver side as possible.

If you are comfortable with working under the hood with no loose clothing, you can have the system running on LO on moderate weather and feel the two metal tubes for the AC at the firewall behind the engine. They should both be cold with the larger one a little cooler. With the blower then on HI, the larger tube should still be cold meaning there's enough freon to cool on the driver side as well as the passenger. This test works best if you have someone to hold the engine revs at about 2000-2500 rpm.

You'll likely find the small entry tube is very cold and the exit tube is slightly cold due to low freon. The ideal is the entry small tube is barely cool and the exit is cold.

Good luck with that. I hope you find just needing to be recharged to proper levels is all that's needed.

punch47

Thanks, freon level is good, real hot air on driver side and cold passenger side, when set to heat temperature same on both sides. Automatic temp control. Thanks, hate to take to garage as I know it will be costly