C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Cooling and Heating Systems
Not Logged In! Login or Register!  Users Online: 10 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Bair's Corvettes
Volunteer Vette Products
CorvetteClothing.com
VetteBookStore.com
Mid America Motorworks

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
EZ2ROLL
rebel
Featured Links

Buy Now
Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


Chevrolet Corvette Restoration Guide
Chevrolet Corvette Restoration Guide


The Corvette Dynasty (Hardcover)
The Corvette Dynasty (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1] 2  
6/6/09 11:58pm - Original Message: 'Heater Core Bypass'
manget1 Lifetime Member
Lifetime Member
- Send Private Message


Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2382
Certainly, the topic of heat inside a C3 has been discussed a number of times.  I know some folks have discussed the bypassing of the heater core, but I glanced around and did not find one specific post to discuss the process.  So, how do I go about doing this in the best way to try to keep the heat out of the passenger area?
 
Thanks in advance!


____________________________________
I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

      States Visited Map

target=_blank>Click for another pic!     And yet another!
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
6/7/09 2:21am - Reply: 'Heater Core Bypass'
tb2k82ce Lifetime Member
Lifetime Member
- Send Private Message


Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
This is the Link ..  I did it when I replaced my heater core which was when I replaced my dash.  I can provide pictures if you need or want them.

If the link does not work it is on the top of the forth page on the "C3 Cooling and Heating Systems" forum.


(inserted clickable link)

Adams' Apple2009-06-07 12:15:00

____________________________________
 
 Reply Reply  Quote Reply w/Quote
6/7/09 10:09am - Reply: 'Heater Core Bypass'
KDADDY79
Former Member
- Send Private Message


Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Hey Marshall,
I went ahead and did that last year. All it took was new heater hoses, a five eighths & a three quarter shut off valve plus a leap of faith, which I got here.
There is some debate over the necessity of connecting the water pump hose to the 2nd. heater hose which enters the intake manifold. I didn't do that but plan on it when I can.
I'm not much of a mechanic but I was able to get it done.
Kevin


____________________________________
 Reply Reply  Quote Reply w/Quote
6/7/09 1:45pm - Reply: 'Heater Core Bypass'
aceinthehole Lifetime Member
Lifetime Member
- Send Private Message


Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
The inline positive shutoff valves work great and it's not complicated once you drain off the coolant. Just cut in to each hose and install a valve, clamp them back on and your all set. Leave open for winter and off during the summer. I did mine down low on the hoses before they enter the fire wall so they were less noticable. 

____________________________________
Jimmy B.
Just can't wait to get on the road again.

 
                             Click to see larger views!
 Reply Reply  Quote Reply w/Quote
6/7/09 4:47pm - Reply: 'Heater Core Bypass'
manget1 Lifetime Member
Lifetime Member
- Send Private Message


Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2382
You know, as common as this problem is, I'm surprised Mid America and the other vendors don't have a "package" solution.  Years ago, I simply did a bypass of my heater core in my 76 Grand Prix by taking the two heater hoses and running them from one to the other with a metal fitting.  Anyone done anything like that?
 
Thanks everyone.  I'll take a look at the links
manget12009-06-07 13:55:23

____________________________________
I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

      States Visited Map

target=_blank>Click for another pic!     And yet another!
 Reply Reply  Quote Reply w/Quote
6/8/09 8:05am - Reply: 'Heater Core Bypass'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
I actually prefer to tie the two hoses together. If what you're trying to do is remove heater core heat from teh passenger compartment, it's the only way to completely eliminate heat transfer. Even with the shut-off valves in both lines, heat will still transfer from the engine-side hoses thru the valves...it's called convection heat. Just because water(coolant) is not circulating thru the core doesn't mean the heat is gone...just diminished.
Do the shut-off valves help? You betcha. But disconnecting the hoses entirely eliminates the heat transfer completely.
It's six one way and half a dozen the other...


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/9/09 5:21am - Reply: 'Heater Core Bypass'
manget1 Lifetime Member
Lifetime Member
- Send Private Message


Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2382

That's exactly what I'm hoping to do Joel!  Anyone know of a part out there designed for that?  Back in the day, I just looked around the shop, but that was a long time ago...



____________________________________
I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

      States Visited Map

target=_blank>Click for another pic!     And yet another!
 Reply Reply  Quote Reply w/Quote
6/9/09 7:58am - Reply: 'Heater Core Bypass'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
One problem will be that the two hoses are different sizes...on is 5/8" id, and the other is 3/4" id. I've used 5/8" pipe, and the 3/4" hose will clamp down it it. It's a bit harder to get the 5/8" hose to stretch to fit a 3/4" pipe...Angry
Your local hardware store will have the part you need...just don't tell them it's for a Corvette...they'll jack the price up...


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/9/09 11:40am - Reply: 'Heater Core Bypass'
dsireme
Former Member
- Send Private Message


South Milwaukee, WI - USA

Vette(s):
1978 L82 4spd coupe/3.73:1 Differential Ratio /Black with Yellow Pinstripes and Black Interior/AC/Tilt/AM FM Stereo/Pretty Much Stock

Joined: 6/3/2008
Posts: 503
One - Thank you Marshall, I actually logged on to ask this question today. Ted and I took the Vette to Madison to see Jeff Dunham (awesome show, front row seats)  and on the way home he said how can you drive in this car, it is so uncomfortable and I said it isn't cushioned that bad and he said "MY ASS IS HOT!" My car is definitely hot and not the way I want it to be. My feet burn have the time. '
 
Two - you guys are scaring me. Can I actually do this myself? We are talking about me, the computer geek here, not a car person.
 
And Joel, what is this tying hoses together, is the like having your tubes tied??? Confused I am so confused. All I know is even when I use my AC the car is still hot at the feet.


____________________________________
 Reply Reply  Quote Reply w/Quote
6/9/09 11:47am - Reply: 'Heater Core Bypass'
dsireme
Former Member
- Send Private Message


South Milwaukee, WI - USA

Vette(s):
1978 L82 4spd coupe/3.73:1 Differential Ratio /Black with Yellow Pinstripes and Black Interior/AC/Tilt/AM FM Stereo/Pretty Much Stock

Joined: 6/3/2008
Posts: 503
Is this the valve everyone is talking about???
 
 
 
Also I had found this:
 
 
 
dsireme2009-06-09 08:49:41

____________________________________
 Reply Reply  Quote Reply w/Quote
6/9/09 12:37pm - Reply: 'Heater Core Bypass'
aceinthehole Lifetime Member
Lifetime Member
- Send Private Message


Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
[QUOTE=dsireme]Is this the valve everyone is talking about???
 
 
Also I had found this:
 
http://temp.corvetteforum.net/c3/joeveto/Hot_Water_Shut-Off.shtml
[/QUOTE]



 Not sure how well the plastic one works. I used the metal style, but you don't have to mess with the copper tubing. You could just buy the screw in hose barbs, and use a little teflon tape to seal the threads.

(fixed quote box)
Adams' Apple2009-06-09 09:56:26

____________________________________
Jimmy B.
Just can't wait to get on the road again.

 
                             Click to see larger views!
 Reply Reply  Quote Reply w/Quote
6/9/09 12:51pm - Reply: 'Heater Core Bypass'
dsireme
Former Member
- Send Private Message


South Milwaukee, WI - USA

Vette(s):
1978 L82 4spd coupe/3.73:1 Differential Ratio /Black with Yellow Pinstripes and Black Interior/AC/Tilt/AM FM Stereo/Pretty Much Stock

Joined: 6/3/2008
Posts: 503
[QUOTE=aceinthehole][QUOTE=dsireme]Is this the valve everyone is talking about???
 
 
 
Also I had found this:
 
 
 
 Not sure how well the plastic one works. I used the metal style, but you don't have to mess with the copper tubing. You could just buy the screw in hose barbs, and use a little teflon tape to seal the threads. [/QUOTE]
 
Screw in what?(no comment some of you) I have no clue what that is.

(fixed quote box)
Adams' Apple2009-06-09 09:58:32

____________________________________
 Reply Reply  Quote Reply w/Quote
6/9/09 1:03pm - Reply: 'Heater Core Bypass'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
[QUOTE=dsireme]And Joel, what is this tying hoses together, is the like having your tubes tied??? Confused [/QUOTE]

Well...I wouldn't know...my tubes have never been tied...Clown(that I'm aware of...)

What I am referring to is removing the hoses from the heater core, and installing a short piece of metal tubing to connect the two hoses(from the engine) together. It's like taking two hoses to make one...does that help?
Adams' Apple2009-06-09 10:04:00

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/9/09 1:18pm - Reply: 'Heater Core Bypass'
dsireme
Former Member
- Send Private Message


South Milwaukee, WI - USA

Vette(s):
1978 L82 4spd coupe/3.73:1 Differential Ratio /Black with Yellow Pinstripes and Black Interior/AC/Tilt/AM FM Stereo/Pretty Much Stock

Joined: 6/3/2008
Posts: 503
[QUOTE=Adams' Apple] [QUOTE=dsireme]And Joel, what is this tying hoses together, is the like having your tubes tied??? Confused [/QUOTE]

Well...I wouldn't know...my tubes have never been tied...Clown(that I'm aware of...)

What I am referring to is removing the hoses from the heater core, and installing a short piece of metal tubing to connect the two hoses(from the engine) together. It's like taking two hoses to make one...does that help?
[/QUOTE]
 
Ok, so pretty much just by-passing the heater core all together... which is a good idea except in wisconsin it maybe hot in the day time but sometimes still 45 in the morning.
 
Can you some how show me what hoses I would do this with? I mean in the hot summer months it would be great.


____________________________________
 Reply Reply  Quote Reply w/Quote
6/9/09 4:01pm - Reply: 'Heater Core Bypass'
aceinthehole Lifetime Member
Lifetime Member
- Send Private Message


Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
[QUOTE=dsireme] Screw in what?(no comment some of you) I have no clue what that is.[/QUOTE]
 
Just to clarify, the metal plumbing style vavles come with different ends. The type shown in the pics were a compression type that use a brass nut and ferrule to tighten and seal around a smooth pipe. I prefer the threaded style that allows you to screw fittings in to both ends. The fittings, also available at the hardware store, are of brass, about 2" long. Threaded on one end and with hose barbs on the other, so that you can slip a hose on to it and clamp it down. I hope that makes sense. I'm just not good with pics yet.


____________________________________
Jimmy B.
Just can't wait to get on the road again.

 
                             Click to see larger views!
 Reply Reply  Quote Reply w/Quote
6/9/09 6:37pm - Reply: 'Heater Core Bypass'
manget1 Lifetime Member
Lifetime Member
- Send Private Message


Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2382
The piece I used 20 years ago on my Grand Prix was a U-shaped metal tube.  I'll check out the plumbing area of my local Home Depot and see if I can find anything with two different sizes on either end.
 
TJ, not sure how you feel riding in your car, but as the driver, I rarely experience issues with heat.  It's always the passenger with issues.


____________________________________
I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

      States Visited Map

target=_blank>Click for another pic!     And yet another!
 Reply Reply  Quote Reply w/Quote
6/9/09 8:46pm - Reply: 'Heater Core Bypass'
crossfire1982
Standard Member
- Send Private Message


Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094
If you are going to install only one valve you would install a valve in THIS hose where Im pointing.   If you are going to install two valves, the second one would go on the hose which exits the heater core and goes to the water pump HERE.  If you prefer the valves not to show, they can be installed under the car but still in reach without lifting the car LIKE THIS.  These valves are under the car near the heater core inlets where the hoses turn upward to connect to the core.  The valves you see are the NAPA valves.

____________________________________

Click for a larger image
Save The Wave


 Reply Reply  Quote Reply w/Quote
6/23/09 10:11am - Reply: 'Heater Core Bypass'
mysticstriper
Former Member
- Send Private Message


Saraland, AL - USA

Vette(s):
1980 L82

Joined: 6/22/2009
Posts: 13
My heater core has been bypassed by  hose, the bad part is I don't see where the hoses should hook to the heater core. I LIKE a heater in the winter even here in the south.So, I'm having vacuum line problems with my A/C-the A/C  blows nice and cold below the dash but the vacuum lines that operate the ducts are not there so I'll be tracing and replacing them but at the same time I would really like to know where my heater core is! On most GMs it's in the fiberglass box that is by the A/C dryer, but I see no tubes sticking out there...help anyone?

____________________________________

Click on image for larger view
 Reply Reply  Quote Reply w/Quote
6/23/09 10:44am - Reply: 'Heater Core Bypass'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
How come mo one makes sure the valve installed into the car is working. The valve installed is operated by vacum from a vacum switch behind the passenger dash panel and is acuated by the temp selector being moved to the off position. (1977) not shure the different year changes but should be similiar. If operation is correct the water is shutoff. then as to Joels point you would want to add the valve on the return side to stop the convection off heat from that hose. which if we were to install another vacum valve on this hose and tee it off, it should block all heat and work automaticly no mechanical valvesneeded?

____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
6/23/09 10:57am - Reply: 'Heater Core Bypass'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
[QUOTE=mysticstriper]My heater core has been bypassed by  hose, the bad part is I don't see where the hoses should hook to the heater core. I LIKE a heater in the winter even here in the south.So, I'm having vacuum line problems with my A/C-the A/C  blows nice and cold below the dash but the vacuum lines that operate the ducts are not there so I'll be tracing and replacing them but at the same time I would really like to know where my heater core is! On most GMs it's in the fiberglass box that is by the A/C dryer, but I see no tubes sticking out there...help anyone?[/QUOTE]
The tubes are on the bottom, need to get under the car to get to them.

____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1] 2  
 Forums -> C3 Cooling and Heating Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30