Windshield fogging and heat flowing at idle - system OFF
I think this is vacuum related, but asking here for confirmation.
With the windows down and the system completely off, upon startup or at idle the windshield will start to fog. You can feel heat coming out of the defogger vent, as well as a little coming out of the floor vents. I checked the vacuum port on the intake and its firmly attached and the lines are not broken, but I think the vac is leaking out somewhere causing this condition. Especially since it only happens at idle. Putting the defroster on will immediately clear it out, and the selector knob appears to function just fine when you actually select some other HVAC control condition. (Heat goes to the floor, max goes to the dash, defroster goes to the windshield, etc...)
1995 Caprice ERE 383
, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
Last edited by atlantadan; 08-25-2016 at 11:33 AM.