Aaaahhhhh!
Thread Starter
Racer
Joined: Jan 2006
Posts: 458
Likes: 0
Aaaahhhhh!
I knew it was too good to be true,no rust everythings there and everything works....except for the heater core!I can't believe I didn't notice the hoses looped back to themselves.I changed the valve covers back to stock today and discovered this,so how much of a PITA is this going to be on an AIR car?Can it be done from inside,or do I have to pull the whole box off the firewall?
Race Director
Joined: Sep 2005
Posts: 18,640
Likes: 121
From: Farragut,TN
According to my chilton repair manual from 68-80 with ac: 1 remove the battery ground cable. 2: drain the cooling system. it is not necessary to evacuate the ac refrigerant. 3: disconnect the heater hoses at the fire wall and plug the pipes. 4:remove the nuts from the distribuator studs protuding through the fire wall. 5: remove the right side dash pad and center cluster. 6:disconnect the right dash outlet from the center duct. 7:remove the center duct fron the selector duct. 8: remove the selector dict to the dash panel and pull it to the right an to the rear. 9: remove the cables and wiring connections from the selector and remove it from the car. 10: remove the tempature door cam plate from the selector duct. 11: emove the heater core and housing from the selector. 12: reverse the removal procedure to install
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Originally Posted by ESC3
Thanks for that PDF,it should help alot,especially the part about stomping the old core to oblivion.I guess this will be next weekends project.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Race Director
Joined: Feb 1999
Posts: 16,978
Likes: 7
From: In Dreams There Is Truth Ohio
Before you get your hopes up high, fit the replacement heater core first.
I ordered a new GM replacement core the sumbeach would not fit, so I took the old and the new to a rad shop, had my original side tanks soldered to the new and the fit was perfect...had I known this, I would have taken the old to the rad shop and had them supply the core. Would have saved me 60.00
I ordered a new GM replacement core the sumbeach would not fit, so I took the old and the new to a rad shop, had my original side tanks soldered to the new and the fit was perfect...had I known this, I would have taken the old to the rad shop and had them supply the core. Would have saved me 60.00
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,028
From: eastern NC
It's also a good idea to test it for leaks before you button things up. I've know a couple of folks that put them all back together only to discover that they leaked. Both also bought less expensive replacement heater cores so that may have been a factor. I would buy the best one available since it's way too much work to do it all over again.
Good luck... GUSTO
Good luck... GUSTO
Burning Brakes
Joined: Nov 2005
Posts: 1,137
Likes: 51
From: Cartersville GA
Keep in mind to check the vacuum system operations before you reinstall everything. You don't want to have to go back in afterwards.
This is one of those "fill the cuss jar" jobs. Keep the young kids out of earshot.....
This is one of those "fill the cuss jar" jobs. Keep the young kids out of earshot.....
Safety Car
Joined: Jun 2004
Posts: 4,652
Likes: 80
From: Lakeland Florida
Is this the heater core leak test.
Take a bicyle tire inner tube, cut it in half, and clamp the ends to the heater inlet/outlet ports.
Fill the inner tube with air through the inner tube valve, and let it sit overnight. If the tube is still full of air, there are no leaks. If it is deflated, then there is a leak somewhere. I guess a big bucket of water would also tell you that by submerging it when it is pressurized also.
also here is a corvetteforum site I saved to help with my heater core when its time comes up.
http://www.corvettefaq.com/c3/C3CoreReplacement.pdf
kdf
Take a bicyle tire inner tube, cut it in half, and clamp the ends to the heater inlet/outlet ports.
Fill the inner tube with air through the inner tube valve, and let it sit overnight. If the tube is still full of air, there are no leaks. If it is deflated, then there is a leak somewhere. I guess a big bucket of water would also tell you that by submerging it when it is pressurized also.
also here is a corvetteforum site I saved to help with my heater core when its time comes up.
http://www.corvettefaq.com/c3/C3CoreReplacement.pdf
kdf
Thread Starter
Racer
Joined: Jan 2006
Posts: 458
Likes: 0
Well the new core is in and the dash is back together without the Gauges.It really wasn't as bad as I thought it would be.It only took about 31/2 hrs to get it done,and probabl another 1 1/2 to get the gauges back in right.The biggest PITA was getting the dash past the A- pillars without busting the 27 year old dried out corners off.I want to clean up the gauges and check everything before I put them back.The only Bubba influence I ran into was the aftermarket radio install,and Bubba was nice enough to not cut the center bezel or factory wiring.While the car was apart I fount the Factory antenna lead and the factory CB lead?HLY CRP!Here's a couple of pics my darkest hour.
Thanks for the info....... sure makes for a better understanding. 
Thread Starter
Racer
Joined: Jan 2006
Posts: 458
Likes: 0
Originally Posted by bigblokvette
did we check the heater core to see if it was bad, could have been a bad vacum line to the blend door letting hot air in when he didn`t want hot air...just a thought from experience........