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05-10-2020, 11:56 PM
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#1 |
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Registered User
 
Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 200
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Anyone Know What This Hole's For?
Getting ready to install my wiring harness for a TBI system. Found this hole with what looks like a factory grommet, but nothing going through it. Located under the heater box. Sorry, one of the pics is sideways. This is a factory A/C 72 Blazer that I don't remember ever seeing or taking anything out of. I'm asking cause if nothing important goes there, then I'll enlarge it some and use it for my TBI. Thanks
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72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup.  Members Met: Aldtime, DeadheadNM |
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05-11-2020, 06:02 AM
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#2 |
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Moderator
Join Date: Jun 2008
Location: Modesto, CA
Posts: 5,775
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Re: Anyone Know What This Hole's For?
Not a definitive answer to your question, but I am thinking that may be for the heater blower motor wire? If so, I think it has a grommet that needs to be installed first, then the wires feed through. I don't have my truck here, so I can't go out to double check. I'll look tomorrow, but I'm sure that others will chime in.
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2018 Chevy Crew Cab 2006 Impala SS 1965 Plymouth Sport Fury 1970 Chevy Longhorn
70 Longhorn CST Build Adding an AM/FM Decal |
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05-11-2020, 07:55 AM
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#3 |
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Carpe manana
  
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,443
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Re: Anyone Know What This Hole's For?
I don’t see a similar hole on my firewall.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308  Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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05-11-2020, 10:41 AM
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#4 |
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Registered User
Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 200
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Re: Anyone Know What This Hole's For?
Thanks for the answers. It looks factory but it's hard to tell. It's about 3/4", so more than one wire went through. Looks like I've got my starter hole for the harness. I just need to get in there today to make sure a passenger foot won't be able to damage it.
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72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup. Members Met: Aldtime, DeadheadNM |
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05-11-2020, 10:46 AM
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#5 |
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Senior Member
Join Date: Jan 2009
Location: huntington beach california
Posts: 976
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Re: Anyone Know What This Hole's For?
If it is on the bottom someone my have done that to identify any leaks in the heating system
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Pulatoy |
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05-11-2020, 10:46 AM
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#6 |
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Registered User
Join Date: Dec 2003
Location: Houston, TX
Posts: 733
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Re: Anyone Know What This Hole's For?
I don't have THAT hole on y 72 CST. I have a different one, on the opposite side. Don't know what it WAS for though, using it for my MSD. First pic is from the engine bay, second is from the passenger seat. Sorry, mine are sideways too.
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'72 K5, known as 'the Fox.' |
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05-11-2020, 10:48 AM
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#7 |
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Registered User
Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 200
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Re: Anyone Know What This Hole's For?
Maybe. At first I thought it could've been some kind of drain. But, there's nothing there TO drain. So, you might be right.
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72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup. Members Met: Aldtime, DeadheadNM |
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05-11-2020, 10:58 AM
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#8 |
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Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,443
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Re: Anyone Know What This Hole's For?
It does appear factory being flared slightly. Interestingly, the holes for tachometer harnesses and auxiliary battery harnesses are also 3/4".
__________________
1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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05-11-2020, 11:10 AM
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#9 |
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Registered User
Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 200
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Re: Anyone Know What This Hole's For?
Yeah Pete. But this is kinda low.
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72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup. Members Met: Aldtime, DeadheadNM |
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05-11-2020, 11:26 AM
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#10 |
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Carpe manana
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,443
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Re: Anyone Know What This Hole's For?
You bet. Just to clarify, I'm not suggesting this hole was for either of those harnesses, which are placed on the opposite side of the firewall near the fuse block.
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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05-11-2020, 11:43 AM
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#11 |
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Registered User
Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 200
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Re: Anyone Know What This Hole's For?
I know. Looks like it may have been added on.
__________________
72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup. Members Met: Aldtime, DeadheadNM |
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