Anybody know what these holes are for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

markeb01 · 02-03-2010, 11:28 PM

Just curious if anyone knows. I've never seen anything mounted in the holes in any factory service or owners manuals or handbooks. I've circled the factory snap plugs in the holes I'm asking about. I'm assuming they're for a big rig application, but haven't seen anything there either.

padresag · 02-04-2010, 12:44 AM

are they for the std heater
ron

**Bugeyev8** · 02-04-2010, 12:48 AM

I think they are for factory AC if I remember correct?

*LILRED66* · 02-04-2010, 01:00 AM

I believe the factory A/C controls had three pull knobs, at least the 4-5-6 Chevy truck factory A/C system does, but I am not sure about the GMC trucks or the '60-'63 model years.

markeb01 · 02-04-2010, 02:12 PM

Thanks for the replies. I've never seen a 60 GMC with factory air, so perhaps that is the answer. The Chevy service manual does show a Cool Pack air conditioning system was available, but doesn't show the operating controls. I'm pretty sure the standard heater used the same plate at the deluxe model, but only had two levers instead of four. Thanks again.

62gmc910 · 02-04-2010, 02:40 PM

I would go with A/C controls marks right on the 2 or 4 slides on the heater
Any big truck stuff that I have seen was mounted below the key in a separate pod Air or vaccum controls etc

thepartsguy · 02-04-2010, 08:38 PM

Maybe the power divider switch or the red and yellow air brake knobs?

02-03-2010, 11:28 PM	#1
markeb01 Senior Enthusiast Join Date: Feb 2007 Location: Spokane Valley, WA Posts: 8,356	Anybody know what these holes are for? Just curious if anyone knows. I've never seen anything mounted in the holes in any factory service or owners manuals or handbooks. I've circled the factory snap plugs in the holes I'm asking about. I'm assuming they're for a big rig application, but haven't seen anything there either.

02-04-2010, 12:44 AM	#2
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: Anybody know what these holes are for? are they for the std heater ron

02-04-2010, 12:48 AM	#3
Bugeyev8 Senior Member Join Date: Aug 2009 Location: San Leandro, Ca 94577 Posts: 854	Re: Anybody know what these holes are for? I think they are for factory AC if I remember correct?

02-04-2010, 01:00 AM	#4
LILRED66 Account Suspended Join Date: May 2005 Location: Kansas City, KS Posts: 3,906	Re: Anybody know what these holes are for? I believe the factory A/C controls had three pull knobs, at least the 4-5-6 Chevy truck factory A/C system does, but I am not sure about the GMC trucks or the '60-'63 model years.

02-04-2010, 02:12 PM	#5
markeb01 Senior Enthusiast Join Date: Feb 2007 Location: Spokane Valley, WA Posts: 8,356	Re: Anybody know what these holes are for? Thanks for the replies. I've never seen a 60 GMC with factory air, so perhaps that is the answer. The Chevy service manual does show a Cool Pack air conditioning system was available, but doesn't show the operating controls. I'm pretty sure the standard heater used the same plate at the deluxe model, but only had two levers instead of four. Thanks again.

02-04-2010, 02:40 PM	#6
62gmc910 Registered User Join Date: Nov 2009 Location: Cremona AB Canada Posts: 370	Re: Anybody know what these holes are for? I would go with A/C controls marks right on the 2 or 4 slides on the heater Any big truck stuff that I have seen was mounted below the key in a separate pod Air or vaccum controls etc __________________ 62 GMC 910 short fleetside 454 super t10 14 bolt w/gov lock 70s c20 front discs (built in the 80s) 65 GMC 930 dualwheel 292 4spd all origonal 39k mi(my sons truck) 63 GMC 950 camperized school bus, (Gus the bus) 350 4speed 2 speed rear 64 GMC 950 "spare" bus 283? 4speed detroit locker 53 GMC 1ton dual wheel bus 78 GMC c25 short course off road race truck(son's truck) 355 th400 14 bolt (www.wheel2wheel.ca) 88 Peterbilt 379 longhood (hauls race truck)

02-04-2010, 08:38 PM	#7
thepartsguy Registered User Join Date: Dec 2009 Location: Kalispell, MT. Posts: 90	Re: Anybody know what these holes are for? Maybe the power divider switch or the red and yellow air brake knobs? __________________ 63 C10 65 Chevy Custom Cab w/ Big Back Window 66 C30 72 skylark w/ 454 65 K10 May the bridges I burn light the way....



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