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

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

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

Vanity Plates
A78VETTE
corvettejoe
Featured Links

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


Corvette: America's Sports Car Yesterday, Today, Tomorrow (Hardcover)
Corvette: America's Sports Car Yesterday, Today, Tomorrow (Hardcover)


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


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



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
4/13/18 5:33pm - Original Message: 'Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
My '75 does not put out much heat from the heater.  It seems that the cars from the 50's and 60's could roast you out of the car with the heat on full blast -- mine does not.

I flushed the heater core and water flowed freely through it.  The fan works fine on all 3 speeds.  I put in a new thermostat (165 degree, I believe).

(I had added a valve in the heater hose, which is turned on full.)

One other note, this was an A/C car, but the A/C had been removed.

Any ideas on why I don't get much heat?  Do most Vette heaters put out enough hot air?



|UPDATED|4/13/2018 2:33:21 PM (AZT)|/UPDATED|


____________________________________
 
  
  
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
4/13/18 6:55pm - Reply: 'Re: Not much heat from heater'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 450
Did you visually verify that the heater valve is open internally? Is it a problem that the air coming out is not hot enough or the air is hot but there's not enough quantity? I drove mine to work daily and in the winter time the heater put out plenty of hot air.

|UPDATED|4/13/2018 3:55:31 PM (AZT)|/UPDATED|


____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
4/13/18 10:10pm - Reply: 'Re: Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
73shark said: Did you visually verify that the heater valve is open internally? Is it a problem that the air coming out is not hot enough or the air is hot but there's not enough quantity? I drove mine to work daily and in the winter time the heater put out plenty of hot air.



Yes, the heater valve that I put in is a ball type made for a heater hose.
I seem to get good air flow (it seems anyway), but it is not very hot.



____________________________________
 
  
  
 Reply Reply  Quote Reply w/Quote
4/13/18 10:58pm - Reply: 'Re: Not much heat from heater'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 450
Try checking the temperature of the hose going in and the hose going out and see if there's any big difference. You can get one of those inexpensive laser temperature guns at Harbor Freight if you don't have one. I assume that the hoses are free and clear.

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
4/16/18 5:11pm - Reply: 'Re: Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
73shark said: Try checking the temperature of the hose going in and the hose going out and see if there's any big difference. You can get one of those inexpensive laser temperature guns at Harbor Freight if you don't have one. I assume that the hoses are free and clear.

I bought a laser temp gun:  The temperature difference between the inlet and outlet heater hoses is about 10 degrees with the heater fan on high.

Checking the temp at the heater air outlet at the passenger side is about 130 degrees (anyone know if this is about right?)  The driver's side is about ten degrees cooler.

How much trouble is it to pull the heater core?



____________________________________
 
  
  
 Reply Reply  Quote Reply w/Quote
4/16/18 9:49pm - Reply: 'Re: Not much heat from heater'
F4Gary Gold Member
Gold Member
- Send Private Message


Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 918
That is certainly hot enough to heat the cabin.

____________________________________
 Reply Reply  Quote Reply w/Quote
4/16/18 10:41pm - Reply: 'Re: Not much heat from heater'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 450
As one that installed factory A/C in mine, I'll say it's medium difficulty.  IIRC, you have to do it from the inside.

What was the temp. of inlet hose? 

If 130* air is heating the interior, then maybe you're not getting enuf air flow.

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
4/18/18 8:16pm - Reply: 'Re: Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
73shark said: As one that installed factory A/C in mine, I'll say it's medium difficulty.  IIRC, you have to do it from the inside.

What was the temp. of inlet hose? 

If 130* air is heating the interior, then maybe you're not getting enuf air flow.

I wonder if when they removed the A/C (assuming they did go inside it -- it looks like the fittings are still jutting out of the housing) they did something to disrupt the airflow in the heater box.




____________________________________
 
  
  
 Reply Reply  Quote Reply w/Quote
4/18/18 8:48pm - Reply: 'Re: Not much heat from heater'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 450
If the evaporator is still in the housing, then perhaps it's clogged w/ debris, mold, and/or mildew.  You can open the housing up w/o removing the engine and check the evaporator.  Not sure why they would've disabled the A/C.  Ermm

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
4/24/18 11:22am - Reply: 'Re: Not much heat from heater'
danascar
Standard Member
- Send Private Message


Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 774
As long as you don't have a run hot problem you might want to change to a 195 degree t-stat. 165 is on the cool side.  

____________________________________
http://www.c3vr.com/member_uploads/14001_14100/14006/IMG_256920168147411r.jpg


 
Dan T
 

 Reply Reply  Quote Reply w/Quote
4/24/18 8:24pm - Reply: 'Re: Not much heat from heater'
stingrayjim jr Lifetime Member
Lifetime Member
- Send Private Message


SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3942
just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door.  Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on....  if you took the map pouch panel off, you'd see the lever on top of the duct.   I have had issue with the wire going to it come off, or not work at all when you roll the heater selector....   i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark...   http://https://www.youtube.com/watch?v=83s8HnUPcIU 

https://www.youtube.com/watch?v=83s8HnUPcIU


|UPDATED|4/24/2018 5:24:28 PM (AZT)|/UPDATED|


____________________________________
StingrayJim
NCM Lifetime Member #1936

Stingray's '76                             StingrayJr's '78                           Lil Red '94

(click each one to see a bigger version)
 Reply Reply  Quote Reply w/Quote
4/24/18 9:27pm - Reply: 'Re: Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
stingrayjim jr said: just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door.  Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on....  if you took the map pouch panel off, you'd see the lever on top of the duct.   I have had issue with the wire going to it come off, or not work at all when you roll the heater selector....   i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark...   http://https://www.youtube.com/watch?v=83s8HnUPcIU 

https://www.youtube.com/watch?v=83s8HnUPcIU




Thanks!  I'll check that soon as I can.



____________________________________
 
  
  
 Reply Reply  Quote Reply w/Quote
4/27/18 8:36pm - Reply: 'Re: Not much heat from heater'
BillHanna
Standard Member
- Send Private Message


Cana, VA - USA

Vette(s):
1975 Stingray

Joined: 7/3/2016
Posts: 107
stingrayjim jr said: just a thought, as i did not notice anyone mentioning this, and sorry if i missed it if they did mention the blend door.  Its a door within the duct that diverts the air from either the a/c evaporator and/or the heater core.... so it doesn't blow hot air when the a/c is on, or cold air with the heater on....  if you took the map pouch panel off, you'd see the lever on top of the duct.   I have had issue with the wire going to it come off, or not work at all when you roll the heater selector....   i'll link a video showing how to replace the heater core, and you can see the small lever with the wire(push/pull type wire) that opens/closes the blend door... it can be seen around the 3 minute mark...   http://https://www.youtube.com/watch?v=83s8HnUPcIU 

https://www.youtube.com/watch?v=83s8HnUPcIU





Okay, I pulled the right-side dash and found the lever.  The cable is hooked to it, and it did move when I moved the heater controls, but after a bit it no longer moved.  Don't know why.
I did notice that the vent to the left front on the heater box did not move at all.  I assume this opens depending on the vent setting to direct heat to the front ducts (the duct work is missing on this car).  I could open it manually, and felt air coming from the opening.  I assume with this closed the air is going mostly to the defroster vent.  Not sure if there is a vacuum issue or what. . .

I'll try to post a picture of the vent I'm talking about:



Wow, I actually got an image uploaded. . . 



____________________________________
 
  
  
 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 2001-2018, 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