1972 Firewall hole question - Chevelle Tech
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post #1 of 10 (permalink) Old Feb 21st, 20, 11:52 AM Thread Starter
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1972 Firewall hole question

Does anyone mind showing me a picture of their 72 chevelle firewall? Preferably directly behind engine? There is a massive hole that I can't figure out what it belongs to. My car is fully hooked up from a wiring perspective, so I can't figure out what goes through this hole. I can post a picture of mine when I get home, but I couldn't wait to post this, thinking I would have found a picture by now, but now luck. Mine is pretty close to my distributor, and is quite large. Help please. (I found older threads about this, but it wouldn't let me comment because of age of thread)
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post #2 of 10 (permalink) Old Feb 21st, 20, 1:15 PM
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Re: 1972 Firewall hole question

Wiper motor hole ?

Speedometer cable Grommet hole ?.

Someone drilled or punched it out years ago for something not factory ?

Yep, pictures might help.

Jim

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post #3 of 10 (permalink) Old Feb 21st, 20, 1:30 PM
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Re: 1972 Firewall hole question

I was going to say the wiper motor hole, but you said the electronics are fully wired, so it's hard to know without pictures.
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post #4 of 10 (permalink) Old Feb 21st, 20, 1:31 PM
 
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Re: 1972 Firewall hole question

You might find your answer in this video. https://youtu.be/APk5ms7DJBE

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post #5 of 10 (permalink) Old Feb 21st, 20, 1:46 PM Thread Starter
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Re: 1972 Firewall hole question

I was able to dig up an old photo on my phone, quality isn't very good, but I think you can still see. And yeah not the wiper motor, best I could come up with was AC wiring, but why would that go through the firewall there? (Thinking out loud).
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post #6 of 10 (permalink) Old Feb 21st, 20, 1:53 PM
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Re: 1972 Firewall hole question

It's from the HVAC control to the A/C, it's there so that it goes up into the wiring gutter above it.

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post #7 of 10 (permalink) Old Feb 21st, 20, 1:57 PM Thread Starter
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Re: 1972 Firewall hole question

Does that get wired into the under-dash harness? or is it kind of its own harness?
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post #8 of 10 (permalink) Old Feb 21st, 20, 3:57 PM
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Re: 1972 Firewall hole question

The A/C wiring harness is a " STAND ALONE Harness ". I do know a 1970 Chevelle A/C harness is Different than a 1971,( 71s have relays under the glove box,,72s??? ) Not sure about 1972s. I would NOT mix & match a Different year A/C wiring harness.
NOTE: When I converted my 1971 Wagon to a 70( It was punched in the nose). I used all 1970 wiring. After I built the car and was getting the A/C up & running......... THATS when I found out about the different A/C harness.
YEP !....... Pull the dash apart remove the 1971 harness and install a 1970 A/C harness. GEE,,, Just think,,, While building the car the dash was out, The engine was out and the seats were out. Looking back,,, I guess I thought I was a " Know it all." I just add it to the list of " My screw / ups ".....
Bob
P.S. Removing the 1971 harness and installing the 1970
A/C harness, I got my 6 foot 4" buddy Scott Miller, He was tall and could lean over the " Covered up "..." Fresh Paint " and not mess it up. I would feed him the 71 to get it out and push the 70 in, through the firewall."
Scott laughed and called this a cluster ---- !


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post #9 of 10 (permalink) Old Feb 21st, 20, 4:26 PM Thread Starter
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Re: 1972 Firewall hole question

This would make sense since I deleted the AC system from my car. Thanks for helping me figure this out. Now to find some type of plug...
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post #10 of 10 (permalink) Old Feb 21st, 20, 7:36 PM
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Re: 1972 Firewall hole question

Quote:
Originally Posted by Robinls5 View Post
The A/C wiring harness is a " STAND ALONE Harness ". I do know a 1970 Chevelle A/C harness is Different than a 1971,( 71s have relays under the glove box,,72s??? ) Not sure about 1972s. I would NOT mix & match a Different year A/C wiring harness.
NOTE: When I converted my 1971 Wagon to a 70( It was punched in the nose). I used all 1970 wiring. After I built the car and was getting the A/C up & running......... THATS when I found out about the different A/C harness.
YEP !....... Pull the dash apart remove the 1971 harness and install a 1970 A/C harness. GEE,,, Just think,,, While building the car the dash was out, The engine was out and the seats were out. Looking back,,, I guess I thought I was a " Know it all." I just add it to the list of " My screw / ups ".....
Bob
P.S. Removing the 1971 harness and installing the 1970
A/C harness, I got my 6 foot 4" buddy Scott Miller, He was tall and could lean over the " Covered up "..." Fresh Paint " and not mess it up. I would feed him the 71 to get it out and push the 70 in, through the firewall."
Scott laughed and called this a cluster ---- !
Bob, i think we all have had a hiccup such as yours ,that we learned from. I have had a few myself. P.S. Love your wagon. Terry
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