Every once an awhile, the A/C temp AND airflow diminish.
I'm suspecting icing on the evap because both problems are similtainous.
If it were a airflow damper, (I believe they're elect not vaccum on the 2500HD), then just airflow would diminish, but the air temp would remain the same.
I loose about 70% temp and airflow.
Anyone tackle this problem? Only happens in extreme heat, then resumes to normal airflow and temp, after parking the truck a spell, and not always happens.
I understand several Pontiac modles have the same phenomina.
I suspect icing on the evap.
Anyone have a take?
Thanks for any imput.