Dennis
Heater Core
Team Owner
Joined: Feb 2003
Posts: 54,103
Likes: 9,418
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
Depends on how many studs you break of the heater box while trying to remove it. Drain the coolant, disconnect the hoses, remove glove box, remove heater box inside and out. Then replace heater core But while the heater box is out it’s a good time to put new seals in the heater box
5th Gear
Joined: Oct 2022
Posts: 5
Likes: 5
Just replaced mine on a 64 convertible. It’s not hard, just time consuming, and at times very frustrating. Glove box and gauge cluster needed to come out first. I don’t believe a 63 has a stud on the firewall behind the dash like a 64 which attaches to the heater box, so you may be able to leave the gauge cluster in the car. Once I got the heater box out, I order a complete heater box rebuild kit from Zip. Everything internal was rusted and/or disintegrated. New seals for the box/firewall itself, as well as the metal retainer for the actual heater core, and (obviously) a new heater core. Heater core was not an exact match dimensionally for my leaking original, but it does fit. You can do it. Just take your time and take lots of pics. I also did it alone. Another set of (small) hands would have been helpful at times. Post questions if you run into issues. I’ll watch the thread.
John
John
Pro
Joined: Nov 2020
Posts: 615
Likes: 272
From: Morgan Hill, CA
It's not a terribly difficult job. I did mine on my 66. I think I removed the battery so I could see up behind there to get the corner studs. I don't recall my gauges having to come out, but the rest of the items mentioned above did come out. Maybe it's different for you fancy 63 guys. 
Mine turned into a bunch of other projects (Painting the speaker cover, new carpet padding, new heater hoses and a general clean up of the entire area.
Rewarding job if you just take care and don't try to rush the job.
Mine turned into a bunch of other projects (Painting the speaker cover, new carpet padding, new heater hoses and a general clean up of the entire area.
Rewarding job if you just take care and don't try to rush the job.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Le Mans Master
Joined: Dec 2004
Posts: 5,394
Likes: 2,768
From: Pittsburgh
2024 C2 of the Year Finalist - Modified
2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
https://redirect.viglink.com/?format...ette-heater%2F
May or may not be relevant.....Worked for replacement on my 65 Coupe
May or may not be relevant.....Worked for replacement on my 65 Coupe
