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Heater Core

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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Heater Core

Posted: 10/28/07 7:17amMessage 1 of 16
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
I am planning to redo my heater core and was wondering. Do I get to from inside the dash? The car has AC or do I get to from the casing that sticks out from the back passenger side  of the engine bay? I have the engine out.
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Heater Core

Posted: 10/28/07 9:44amMessage 2 of 16
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Littleton, CO - USA
Joined: 2/5/2006
Posts: 50
Vette(s): 76 corvette, L-48, Flame Red
From the dash side.  You have to remove the lower dash on the passenger side.  Also, you need to remove the hoses and the insulator (if still there) where they go up into the heater core from below.  When removing the bolts that hold the plenum divider (think that is what it is called), watch for one trick bolt that goes all the way through the firewall and has a nut on the outside (this one drove me crazy for awhile).  Be very careful pulling the heater core up and out.  The piping is soft and can break off if not handled gently or has a little too much corrosion.  Also get one of the gasket kits to put everything back together with (mine came from Zip).

If you search on this subject, somebody posted pictures and a description of the procedure a year or two ago and it is very helpful if you haven't been through it before. 

Good luck.
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Heater Core

Posted: 11/2/07 6:19amMessage 3 of 16
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Dorr, MI - USA
Joined: 8/21/2002
Posts: 2581
Vette(s): 71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp
I'm with ya man. My pass. windshield fogged on me the other day. It did it again this morning. Looks like another winter project.
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Heater Core

Posted: 2/3/08 1:37pmMessage 4 of 16
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
DSC00153.jpg%20picture%20by%20thizzcity44
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Heater Core

Posted: 2/3/08 1:41pmMessage 5 of 16
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Former Member
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
DSC00153.jpg%20picture%20by%20thizzcity44
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Heater Core

Posted: 2/3/08 1:44pmMessage 6 of 16
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Hey I took the pad dash off and looks like I have to take the gage panel also. I tryed posting pictures and screwed that up. It looks more involved then just the dash pad.
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Heater Core

Posted: 2/3/08 9:13pmMessage 7 of 16
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East Hanover, NJ - USA
Joined: 9/25/2004
Posts: 525
Vette(s): '68 Black Conv. Matching 327/300 4 Spd. P/S, P/B, P/W, Tele, A/C
Dave,
 
You're right, the center gauges have to come out also.

Anthony
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Heater Core

Posted: 2/3/08 10:58pmMessage 8 of 16
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Burke, VT - USA
Joined: 1/23/2002
Posts: 7605
Vette(s):
SOLD - "The Toy" - '70 Convertible
SOLD - "The Beast" - '90 ZR-1 (#682)
SOLD - "Betty" - '28 Ford Model A Tudor
SOLD - "BLKBRRD" - '78 Pontiac Trans Am
"BLUBYU" - '04 Coupe
Check this out (click here) for a look at replacing the heater core in a '70.  This was in an old thread (found using the Search function) and posted by a former member.

Jim Olson 

"The Toys"...!!!  Save the Wave!

Where I've been in a Corvette...!!!

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Heater Core

Posted: 2/4/08 9:07amMessage 9 of 16
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Hey thats a good thread to have thanks. To take the Evaporator and blower housing from the engine bay are there bolts from inside the car to undo?
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Heater Core

Posted: 2/4/08 9:56amMessage 10 of 16
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Burke, VT - USA
Joined: 1/23/2002
Posts: 7605
Vette(s):
SOLD - "The Toy" - '70 Convertible
SOLD - "The Beast" - '90 ZR-1 (#682)
SOLD - "Betty" - '28 Ford Model A Tudor
SOLD - "BLKBRRD" - '78 Pontiac Trans Am
"BLUBYU" - '04 Coupe
To be honest I don't know.  I don't have A/C on "The Toy" so I'd have to look at the AIM to see the detail. 

Jim Olson 

"The Toys"...!!!  Save the Wave!

Where I've been in a Corvette...!!!

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