Heater temperature control doesn't work. on 1999 Chevrolet Lumina

Regardless of whether I set the control to hot or cool I get hot air all of the time.

Asked by for the 1999 Chevrolet Lumina
1 answer 1 comment
my email is chevyase@aol.com please email me your email and I will send you a Diagnostic Worksheet to figure it out.