View Single Post
Old 07-11-2020, 08:41 AM   #6
Mike C
Registered User
Mike C's Avatar
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,440
Re: Opening under dash

It's just an additional vent and clearly you are getting heat polution in your duct system from somewhere else. If it is blowing 40 out of there then that is the temp your ac is cooling to. You need to check flapper doors, heater shut off valve, etc. and you should be able to get 40 degree air from all the vents.
44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
Mike C is offline   Reply With Quote