for the past few weeks I've noticed that the heater stops working after ten minutes or so. its very warm then all of a sudden it gets cold in the car
also I could be wrong but I think it increased the temp by one degree on its own
I have the dual digital climate zone system

_________________

2007 Pontiac Grand Prix
CAI, HV3, ER Rockers, PLOG, Overkill Tune
http://www.cardomain.com/ride/2990036

Do you get any heat at all when you increase the temperature all they way up it will go?
Also somthing to try with the car off remove the hvac fuse in the passenger side fuse panel for one minute then put it back in, then start the car and leave the engine running for 1 minute but do not touch the hvac controls until that one minute is up.
This will reset and recalibrate the climate control, Let us know if this works

thanks that fixed the problem

_________________

2007 Pontiac Grand Prix
CAI, HV3, ER Rockers, PLOG, Overkill Tune
http://www.cardomain.com/ride/2990036

Welcome