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: 20 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

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

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

Vanity Plates
M939
Dave in Kentucky
Featured Links

Buy Now
Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Corvette 50th Anniversary
Corvette 50th Anniversary


The Corvette Factories: Building America's Sports Car (Hardcover)
The Corvette Factories: Building America's Sports Car (Hardcover)


Corvette by the Numbers
Corvette by the Numbers



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
12/21/08 12:23am - Original Message: 'Is heater core bad ?'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
 Today when I ran the vette,i got white smoke coming out from under the hood.I opened the hood and the smoke was coming from the passenger side up threw the wiper tray drain. After the car warms up ,and I start driving it stops.Is this a sign of the heater core going up?
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
12/21/08 12:31am - Reply: 'Is heater core bad ?'
Okie Dude Lifetime Member
Lifetime Member
- Send Private Message


Eastern Oklahoma County, OK - USA

Vette(s):
1980 Black L48 T-Tops

Joined: 1/3/2006
Posts: 1560
Can you smell antifreeze in the corkpit when you have the defroster on?  That is a dead giveaway. 

Only saw white smoke once and it was on my '68 Impala.  That was a teenagers failure to get the electricians tape all the way down the connection.  I smoked the dash wiring.  Hard to drive with a car full of smoke!


____________________________________
Dennis Smith
C3VR Lifetime Member #103

Click for larger view!
 Reply Reply  Quote Reply w/Quote
12/22/08 12:34am - Reply: 'Is heater core bad ?'
lukesvette Lifetime Member
Lifetime Member
- Send Private Message


HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Check the passenger carpet. If the heater core let go, you'll usually get anti-freeze running down to the floor pan  - hence the smell....

____________________________________
LukesVette Homepage
Veteran of Operation Iraqi Freedom
101st Airborne(AirAssault!)
God Bless America

Support Our Troops


     
 Reply Reply  Quote Reply w/Quote
12/22/08 8:58am - Reply: 'Is heater core bad ?'
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
As has been said, check the pass side floor for water. If it's wet there, then heater core has sprung a leak. You will usually get steam from the defrost vent, too, when the core leaks.
However....IF the floor is dry, and no steam comes from the vents, you may have an electrical issue that is letting the smoke out of the wires somewhere...heater cores will normally leak all the time...not just when cold. If the core is leaking slightly, it may be that the exhaust is burning off the coolant that drips on it overnight from the core leak, which could explain only seeing the steam/smoke when it's cold/first started.
Either way, it ain't good...you got some work to do!



____________________________________
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
12/22/08 9:57pm - Reply: 'Is heater core bad ?'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
No it's not electrical,Steam comes out of the deforster vent and the pass floor is wet I thought it was my weather striping going bad. Now I know.One more question if I valve off the heater lines that should keep it from leaking.I am replaceing the dash in the spring so I will also be doing a heater core too.

____________________________________

(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
12/22/08 10:33pm - Reply: 'Is heater core bad ?'
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
Yeah, you can remove the hoses and tie them together for the time being. I wouldn't recommend blocking the flow with a shut-off valve, even tho a lot of folks do that. I just feel it's better to let the coolant flow thru the hoses and water pump the way it was designed. Blocking the flow can effect the way the coolant flows thru the heads/block. That's just me...

____________________________________
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
12/23/08 1:26am - Reply: 'Is heater core bad ?'
Okie Dude Lifetime Member
Lifetime Member
- Send Private Message


Eastern Oklahoma County, OK - USA

Vette(s):
1980 Black L48 T-Tops

Joined: 1/3/2006
Posts: 1560
If the hoses are old, you could pull them off, change the nipple in the intake so it is the same as the water pump nipple and use a new section of hose 5/8 or 3/4, whichever way you want to go so you keep the flow going (important in older men and older cars).

If the hoses are new, you could either pull them off and do as above, or get a union that is 5/8 on one end and 3/4 on the other.  That and a couple of clamps and you're good to go.

The location of the hoses on the heater core isn't the easiest to gain access to, especially if you don't have a lift or ramps to get her in the air so you can lay under her just behind the passenger side front wheel.  Or you can pull the wheel for easier access.

Good Luck!


____________________________________
Dennis Smith
C3VR Lifetime Member #103

Click for larger view!
 Reply Reply  Quote Reply w/Quote
12/25/08 12:30am - Reply: 'Is heater core bad ?'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736

How many hoses are going to the heater core? I have 2 that run into the fire wall and i can get to them without raising the car.Am I missing something?

                       Rick
 


____________________________________

(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
12/25/08 12:49pm - Reply: 'Is heater core bad ?'
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
Nope...just the two...one in, one out. If your car has A/C, the hoses run to the bottom of the A/C plenum. If you do not have A/C, then they'll run directly into the firewall area.

____________________________________
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
12/25/08 10:19pm - Reply: 'Is heater core bad ?'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
 Thanks that what i thought,but wanted to be sure.
              Rick


____________________________________

(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
12/26/08 1:06pm - Reply: 'Is heater core bad ?'
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
Late last summer I installed shut off valves on both heater hoses. I was very happy with the resulting lack of excessive heat. The car ran great and seemed not to run any hotter.
However, along the lines of what Joel mentioned, I did wonder if the lack of coolant flow back in to the intake manifold area could cause a problem.
 
So now I'm wondering if we can have the best of both worlds;
Are there shut off valves available with 1 inlet and 2 outlets?
 
I'm thinking that a valve of this type could allow for coolant to be allowed in to the heater core as needed and otherwise be looped to the second heater hose that allows coolant to pass back thru the intake manifold.
 
Any ideas?
 


____________________________________
 Reply Reply  Quote Reply w/Quote
12/26/08 2:15pm - Reply: 'Is heater core bad ?'
corvette440hp Lifetime Member
Lifetime Member
- Send Private Message


Joined: 7/2/2006
Posts: 8205
[QUOTE=KDADDY79]Late last summer I installed shut off valves on both heater hoses. I was very happy with the resulting lack of excessive heat. The car ran great and seemed not to run any hotter.
However, along the lines of what Joel mentioned, I did wonder if the lack of coolant flow back in to the intake manifold area could cause a problem.
 
So now I'm wondering if we can have the best of both worlds;
Are there shut off valves available with 1 inlet and 2 outlets?
 
I'm thinking that a valve of this type could allow for coolant to be allowed in to the heater core as needed and otherwise be looped to the second heater hose that allows coolant to pass back thru the intake manifold.
 
Any ideas?
 
[/QUOTE] I'm in favor of keeping the flow of the coolant. The water pump is constantly attempting to pump.........whether the stat is open or not.

____________________________________
corvette440hp
 Reply Reply  Quote Reply w/Quote
12/26/08 3:33pm - Reply: 'Is heater core bad ?'
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 "440",
That makes me think of simply running a joined (both sizes) heater hose from the water pump right back in to the intake manifold. This would obviously leave the heater core "out of the loop".
My reason for not doing that was to leave some coolant in the heater core so as not to let it dry out and go bad.
Does this make any sense?
 
Tinbender,
I hope I havn't blown this up and confused you.
I think there's an answer in here for both of us.
Kevin


____________________________________
 Reply Reply  Quote Reply w/Quote
12/26/08 5:34pm - Reply: 'Is heater core bad ?'
corvette440hp Lifetime Member
Lifetime Member
- Send Private Message


Joined: 7/2/2006
Posts: 8205
[QUOTE=KDADDY79]Hey "440",
That makes me think of simply running a joined (both sizes) heater hose from the water pump right back in to the intake manifold. This would obviously leave the heater core "out of the loop".
My reason for not doing that was to leave some coolant in the heater core so as not to let it dry out and go bad.
Does this make any sense?
 
Tinbender,
I hope I havn't blown this up and confused you.
I think there's an answer in here for both of us.
Kevin
[/QUOTE] Looping the hoses together will create a flow path. I'm rebuilding my 74 from the ground up, and not even going with a heater core, just AC. What I did was to connect a fitting on the intake manifold, that was before the t-stat, with another fitting on the top of the water pump. I made up a stainless (Russell) hose to connect from the manifold to pump. When the stat opens, the flow goes to the radiator, flow in the path of the least resistance.

____________________________________
corvette440hp
 Reply Reply  Quote Reply w/Quote
12/26/08 11:42pm - Reply: 'Is heater core bad ?'
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
Kevin, you're right in thinking that leaving some coolant in the core will help keep it from rotting when not in use.
You can have a "bypass" system for the heater core that will block coolant from circulating thu it, but still allow it to circulate thru the hoses, but it requires some plumbing to achieve, and one more valve like the ones you have now, or...a diverter type valve, and a "T" fitting for one of the hoses. Sounds like a plumber's nightmare...
It may be a bigger pain than it's worth. Keeping coolant flowing thru those hoses is NOT a life-or-death kinda deal....lots of cars run around with NO heater hoses even connected, and the fittings on the intake/water pump are plugged. I know it sounds like I'm waffling here(I could be a politician, no?), but my original point was keeping coolant running thu the hoses if the hoses are connected is better than blocking them completely...imho

____________________________________
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
12/27/08 10:19am - Reply: 'Is heater core bad ?'
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 Joel,
You still got my vote---it's cool LOL Thanks to you & "440" for the input!
This may be one of those jobs I don't have to do, but do anyway.
 
Tinbender,
Let us know how you make out on this.
Kevin 
 


____________________________________
 Reply Reply  Quote Reply w/Quote
12/27/08 11:42am - Reply: 'Is heater core bad ?'
corvette440hp Lifetime Member
Lifetime Member
- Send Private Message


Joined: 7/2/2006
Posts: 8205
Something that I did with the engine is to install a mechanical screw in 3/8" mpt guage into the manifold. This allows you to check the engine temp from under the hood, and this is directly in the engine before the thermostat. It gives the engine temperature not the radiator temperature. Here is the link...it's liquid filled to take out the engine vibrations:   http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D350120&N=700+4294925228+4294925227+400304+4294822101+4294908416+4294907780+115&autoview=sku

____________________________________
corvette440hp
 Reply Reply  Quote Reply w/Quote
12/27/08 10:30pm - Reply: 'Is heater core bad ?'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
Lucky for me the heater core in my car is setup very basic. No A/C a inlet and outlet hose.In the spring when the weather wams up I will change it at the same time I do my dash.

____________________________________

(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
1/2/09 12:03pm - Reply: 'Is heater core bad ?'
beachbum43_1999
Former Member
- Send Private Message


Newark, DE - USA

Vette(s):
Present: '76 l-48 #433257 Bldg: '59 #5366 Prev. '59, '62, '62 '

Joined: 1/11/2005
Posts: 20
I went with the reducer method out by the water pump about 6 yr.s ago, since mine goes into "Hybernation" about  Nov. and doesn't come out until Easter or so.
 
JB
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 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