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07-10-2020, 10:02 PM
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#1 |
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Registered User
Join Date: Apr 2016
Location: Kennesaw, Georgia
Posts: 48
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Opening under dash
Can anyone tell me what this opening under the control box? under the dash is? The AC is blowing out about 60 degrees but 40 on this vent. Thanks.
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1972 GMC 1500 1/2 Ton, LWB, Fleetside, 350, Automatic, 3rd Owner. |
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07-10-2020, 10:14 PM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Opening under dash
I've always wondered what it was for also. I always figured it was for your feet. I would like to know the reason for it also.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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07-11-2020, 12:02 AM
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#3 |
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Registered User
 Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Opening under dash
If it is blowing that cold I would venture to say its there to prevent the unit from freezing up.
Common sense, SWAG, or corrected error on part of GM. |
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07-11-2020, 12:07 AM
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#4 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,853
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Re: Opening under dash
I always figured it is for the feet if desired. You should be able to shut it.
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Jim |
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07-11-2020, 07:04 AM
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#5 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: Opening under dash
The only way mine would blow 40 degrees would be in the dead of winter before the engine wanted up...ac delete here.
I think it's more of a winter time heat option to help warm or dry wet feet. It pops shut with a little pressure.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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07-11-2020, 08:41 AM
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#6 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,728
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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.
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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 |
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