Mine did this also. I had installed a new battery and for some reason the driver side of the zone climate control blew hot air and the passenger was cold. A simple pull of the negative cable on the battery for about 3 minutes solved my issue by allowing the computer to reset. Worth a try.....
Some reasons, low on refrigerant, compressor not activating , switch not sending power to ac clutch , no power to ac switch, leak in system , plugged ort restricted refrigerant flow in system, there are to many reasons to list all, have a qualified AC repair shop diagnose your problem could range from insignificant problem to a much more serious and costly repair...
SOURCE: AC blows hot air
try this website fix & troubleshoot heating & A/C www.automedia.com and another car A/C repair www.directgardening.com
SOURCE: ac blowing hot air on passenger side only
If you only need the A/C to work (at least for now) on the passenger
side, remove the panel from below the glovebox. It requires, I think, a 7
or 8 mm socket. Once this is down you will see a little white, plastic
arm hooked to a threaded, metal shaft. Manually push the shaft and
plastic arm toward the driver's side of the vehicle and cold air (if the
system is, in fact working properly) will miraculously come from the
passenger side.
You can take a plastic tie-wrap and secure the arm in this position as
long as is desired in order to obtain the desired result, but of course,
me-says go to your nearby mechanic and have him replace the programmer
(it is a bit costly, but if your LeSabre is in any decent condition it
is worth the investment).
SOURCE: I HAVE A CONVERSION VAN
Once again, it could be the temperature doors not operating correctly on the rear hvac module.
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