Originally Posted by
dedwards0323
I did the Heater Duo Valve Flush per the attached document. Solved the problem on my 2007 Coupe. I figure if it pops up again, I'll take the Duo Valve apart & replace parts per the Service Kit.
I will try this as well.It might solve my warm air problem. I'm still going to have to figure out my fan speed controller.
I'm thinking that's a bad potentiometer.
Thanks,
John