Topic: Replacing heater core
in Forum: C3 Cooling and Heating Systems
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Lifetime MemberWell I finally decided to dive in and do it. I collected all the parts over the last few years so in I go. I have a coupler of links to articles on what to do so I won't be braking anything I hope.
Wish me luck.
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
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Have fun with that project...!!! Look back through this forum for a thread posted by Juliet that photo documented the swap done on her '70 convertible.
Jim Olson 
"The Toys"...!!! Save the Wave! 
Former Member
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
If it does not have A/C, it isn't that big a job. I have done it through firewall from under the hood, so you don't have to take the heater box completely out.
Larry
Larry
Former Member
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Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
When I see you in Holland let me know all about it. Every year I have to add freon because it all leakes out. Corvette guy thinks it may be leaking at the heater core but has not tested there yet. No detectabole leaks in the engine compartment. Anybody got an idea???
Well I got her back together today. Not that bad of a job but I could tell someone had been in there before. The new core was not exactly the same as the one that came out but it fit well enough for me to finish the job. I will post pics later this week when I get the chance. The one I took out looks like it was about to leak, lots of green around the one pipe. I am not sure if it was the original core that may have been repaired in the past but it looks like someone used putty to seal the small pipe. In fact the pipe broke loose when I was taking it out.
Redwingvette 2010-04-26 18:28:05
Jim, I had Juliet's link book marked and that sure did help.
Here is the link: http://www.corvetteforum.net/c3/juliet/heatercore/HeatCore_orig.htm
The other link I had: http://www.corvettemagazine.com/technical-articles/c3/81-heater-core-and-box-rebuild.html
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
Good job B. I knew ya could do it. The tricky part I had was discovering there was a nut on the stud behind the evap case.
That was surely a discard.
Dan. The heater core and the A/C system are not connected. If your leaking refrigerant it could be coming from a number of places, but you won't see anything in the egn. compartment as it leaks out as a gas.
See you guy's in a couple weeks!!!
That was surely a discard.Dan. The heater core and the A/C system are not connected. If your leaking refrigerant it could be coming from a number of places, but you won't see anything in the egn. compartment as it leaks out as a gas.
See you guy's in a couple weeks!!!
Former Member
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Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
I know that Terry. My Corvette guy uses a disclosure type fluid that showes if it is leaking. Cannot see leak in engine area. I will have had the syster refurbished by the time I see you in Holland.
Dan
in Forum: C3 Cooling and Heating Systems
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