Pontiac Repair: pontiac montana 2000, pontiac montana, ac works

Question
the front ac works but the back one blows warm air

Answer
Hey Juan:

there are a few things it could be. Low on a charge of 134A in the system. an issue with the TXV valve for the rear evap core or the temp door for the rear unit is stuck inbetween hot and cold. with out seeing It I can't tell you which of the 3 that the issue is.