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replace the Heater core

Red73BB

Well-known member
Joined
Jun 15, 2001
Messages
241
Location
Defiance, MO
Corvette
1969 dark red convert
I need to replace the heater core on my '69. Without removing the A/C parts in the engine compartment is there an easier way to do the replacement?
First I will try Stopleak to see if that does the trick.


Thanks,
Gary
 

SVO

Well-known member
Joined
Jan 11, 2011
Messages
332
Location
Texas Gulf Coast
Corvette
69 L68 Vert, 72 LS-5 Cpe, 72 LT-1 Air 'Vert
Word of caution- Stopleak is a temporary fix and may cause you problems with plugging in the radiator. Best to bite the bullet and fix it properly.
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
When you get the new core, apply some low pressure air to it, cap the other end, and drop it a bucket of water to check for leaks. The quality on cores is not what it once was and you don't want to go through all the work on an a/c car to find it as a leak! Been there and it wasn't fun. On a non a/c car you can swap the core from the firewall but an a/c car will require a tear down- unless someone found a better way.
Good luck.
 

Whiteshadow89158

Well-known member
Joined
Apr 3, 2008
Messages
244
Location
Orange County,CA
Corvette
1981 dark purple coupe
You can try a product called steel seal. I've never used it but its supposed to be a permanent fix compared to other related products.
 
Joined
Nov 23, 2002
Messages
1,060
Location
Motorcity USA
Corvette
1973 L-48 Coupe
I wouldn't put that or any other stuff in the system.....water ALWAYS wins and you eventually end up tearing it out just to leave that slime in the walls of your system.
I did mine in an afternoon with AC....my only advise is to remember that there is a screw that is attached from inside the engine compartment. ( mine is a '73)....other than that its not too big of a task.
Good luck. :w
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
Do not use "stop leak" products.

Yes, in some cases, they can seal leaks.

Unfortunately, they do this by coating the inside of the cooling system with a thin, pliable coating which inhibits transfer of heat from the engine cooling jackets to the coolant. So, yes, your leak might be sealed but the cooling system does not cool as well afterwards.

Replace the heater core or have it repaired.
 

Red73BB

Well-known member
Joined
Jun 15, 2001
Messages
241
Location
Defiance, MO
Corvette
1969 dark red convert
Thanks for the replies

I did replace the core by removing the dash and accessing the heater box. It takes time, but at least iI feel that if was done correctly. I search the web and found a couple of do-it-yourself sites w/pictures. very helpful
 

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