I have a 2000 DTS. A/C works fine when outside temperature is mid 80 and below. Above mid 80 and 90 degrees outside A/C blows hot air through all vents. Any ideas? Thanks Guys.

 

sounds like a sensor is shutting system down.
low refrig?
engine running to hot?

 

Thanks. Engine doesnt read hot.

Even at moderate temps left side is blowing a little warmer than right. Swapped over temp sensors left and right. No difference. I am beginning to think its the instrument panel module. I get a code B0429 but thats the rear hvac dooractuator. Again manual points toIPM. I think thats a dealer replacement isntit because the manual says it has to be calibrated

Thanks again.

 

Alsos checked refrig. Thats OK