69 A/C heater core
Thread Starter
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
69 A/C heater core
First time doing a heater core job on an GM A/C car. I have the center guage section out. Have found 4 fasteners that secure the interior distribution box. Non A/C cars use 5 fasteners. The AIM is open on the bench, but doesn't specify how many fasteners. So how many are there and where is the last one hiding? If you have any tips on doing this repair please come forward. Like there is a clamp that secures the heater core tubes in place in the engine compartment that looks like you cannot get at unless you remove the A/C housing Under the hood. Your comments are welcome, Thanks T
Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,374
From: Westminster Maryland
Hi t,
No a/c experience here!
I'm looking at the 71 AIM. I see only 4 fasteners for the box itself.
Is the center distribution duct that comes off the side of the box holding it in place?
Is the heater core holding it in place?
Is 'sealer' holding it in place?
???
Regards,
Alan
No a/c experience here!
I'm looking at the 71 AIM. I see only 4 fasteners for the box itself.
Is the center distribution duct that comes off the side of the box holding it in place?
Is the heater core holding it in place?
Is 'sealer' holding it in place?
???
Regards,
Alan
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
There are three bolts and one stud that I can remember. Here is the backside of a box.
Last edited by Willcox Corvette; Jan 16, 2016 at 10:45 AM.
Race Director
Joined: Oct 2000
Posts: 12,683
Likes: 3,137
From: Shamong, NJ
It's been a while since I changed an AC core, but if I recall correctly, there's one bolt under the hood, that you have to loosen or remove the evaporator box to get to. It might actually be the nut on the stud, that Willcox referenced. Either way, I don't think the AIM shows it clearly, and the shop manual doesn't explain it.
Le Mans Master
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Here's the nut that you have to remove:
Photo thanks to Paul74:
You need molded heater hoses with your A/C Corvette:
Photo thanks to Paul74:
You need molded heater hoses with your A/C Corvette:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski