Reducing unwanted heat in cab - The 1947 - Present Chevrolet & GMC Truck Message Board Network

graymond1967 · 07-03-2015, 12:20 AM

I have a 67 with factory air, not presently working, but the heater core is throwing off a lot of heat. The floor has been insulated with dynomat and it is staying cool.

How have you guys/girls dealt with this?

Insulate the outside of the heater box?

Put a valve in the heater hose by the manifold to turn off the fluid?

Does the vintage air system work better for heat than the stock system?

I am putting a serpentine system on the truck to get rid of the drive belts. So I am open to options.

Truck is a 67 with a 502 big block with headers. Currently I have about 10 to 15 inches of vacuum at idle.

Ray

swamp rat · 07-03-2015, 01:09 AM

Did you check to see if the flap valve on the box is shut when the temp control lever is all the way closed?

Mmorgan32 · 07-03-2015, 02:00 AM

I'm experiencing the same thing. I have an ac truck but half the components are gone. There is not an off position on the switches it just says fan at the top and high at the bottom. Is there a away to stop the air from coming in from the engine compartment without compromising my heater ( I'd like to still be able to use it if I ever need defrost or in the winter)

graymond1967 · 07-03-2015, 02:10 AM

Quote:

Originally Posted by swamp rat

Did you check to see if the flap valve on the box is shut when the temp control lever is all the way closed?

No, I have not, but that is a good suggestion. Will check that out. Thanks.

ray

7tee · 07-03-2015, 07:44 AM

Quote:

Originally Posted by graymond1967

I have a 67 with factory air, not presently working, but the heater core is throwing off a lot of heat. The floor has been insulated with dynomat and it is staying cool.

How have you guys/girls dealt with this?

Insulate the outside of the heater box?

Put a valve in the heater hose by the manifold to turn off the fluid?

Does the vintage air system work better for heat than the stock system?

I am putting a serpentine system on the truck to get rid of the drive belts. So I am open to options.

Truck is a 67 with a 502 big block with headers. Currently I have about 10 to 15 inches of vacuum at idle.

Ray

Yes on the heater hose shut off valve, it helped mine...

67-C20-CST · 07-03-2015, 10:06 AM

Quote:

Originally Posted by 7tee

Yes on the heater hose shut off valve, it helped mine...

X2 only open mine in the winter when I ned the heater..

Tillik · 07-03-2015, 10:43 AM

Wish my 67 had factory air. No carpet kit or floor insulation. It is soooo freaking hot in the summertime. Is it pretty common to eliminate the heater core circulation for the summer? That would probably help with heat a little.

**Already Gone** · 07-03-2015, 11:07 AM

The A/C in my truck had been converted to 134A when I bought it and the ball valve lever was on it already. It works well cutting the hot rad fluid from going through the heater core in summer.

19673ontree · 07-03-2015, 11:25 AM

Same here on my 67 im gonna try the valve to isolate heater core but I think some of the heat is just heat from around the engine ,, mine with the underdash AC will freeze u driving slow but at 55 or 60 you get a bit of heat blowing in some how

Mmorgan32 · 07-03-2015, 03:26 PM

My truck is missing the compressor and bracket and the lines that go to the bracket. I'm considering doing an ac delete panel( but keeping everything) and on day doing vintage air. Has anyone done the delete panel? Do you think it would help? Mine as soon as I start driving hot air just blows in. Is there a valve that's open that I can shut and if so where is it?

07-03-2015, 12:20 AM	#1
graymond1967 Registered User Join Date: Oct 2011 Location: White Rock, BC Posts: 41	Reducing unwanted heat in cab I have a 67 with factory air, not presently working, but the heater core is throwing off a lot of heat. The floor has been insulated with dynomat and it is staying cool. How have you guys/girls dealt with this? Insulate the outside of the heater box? Put a valve in the heater hose by the manifold to turn off the fluid? Does the vintage air system work better for heat than the stock system? I am putting a serpentine system on the truck to get rid of the drive belts. So I am open to options. Truck is a 67 with a 502 big block with headers. Currently I have about 10 to 15 inches of vacuum at idle. Ray __________________ 1967 Chev C10, in the family since 1967, iron head 502, turbo 350, white with red, unrestored. 1970 Acadian SS350, 350 with muncie 4 speed, 12 bolt, best time 13.414 @ 103.72

07-03-2015, 01:09 AM	#2
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Reducing unwanted heat in cab Did you check to see if the flap valve on the box is shut when the temp control lever is all the way closed? __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

07-03-2015, 02:00 AM	#3
Mmorgan32 Registered User Join Date: Jul 2013 Location: Fresno, ca Posts: 303	Re: Reducing unwanted heat in cab I'm experiencing the same thing. I have an ac truck but half the components are gone. There is not an off position on the switches it just says fan at the top and high at the bottom. Is there a away to stop the air from coming in from the engine compartment without compromising my heater ( I'd like to still be able to use it if I ever need defrost or in the winter) __________________ 1972 gmc c15 short bed... Sold 1970 chevy custom camper patina daily driver Last edited by Mmorgan32; 07-03-2015 at 02:02 AM. Reason: Forgot to write something

07-03-2015, 10:43 AM	#7
Tillik Registered User Join Date: Sep 2012 Location: Layton, Utah Posts: 187	Re: Reducing unwanted heat in cab Wish my 67 had factory air. No carpet kit or floor insulation. It is soooo freaking hot in the summertime. Is it pretty common to eliminate the heater core circulation for the summer? That would probably help with heat a little. __________________ James B. 1967 Chevy Fleetside Shortbed 4X2 (Black & Beautiful) 1971 Chevy Fleetside Shortbed 4X4 (White & Rough)

07-03-2015, 11:07 AM	#8
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,149	Re: Reducing unwanted heat in cab The A/C in my truck had been converted to 134A when I bought it and the ball valve lever was on it already. It works well cutting the hot rad fluid from going through the heater core in summer. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

07-03-2015, 11:25 AM	#9
19673ontree CAN'T FIX NOTHIN Join Date: Sep 2006 Location: SOUTHRUST VIRGINIA !!! Posts: 2,112	Re: Reducing unwanted heat in cab Same here on my 67 im gonna try the valve to isolate heater core but I think some of the heat is just heat from around the engine ,, mine with the underdash AC will freeze u driving slow but at 55 or 60 you get a bit of heat blowing in some how __________________ 1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC

07-03-2015, 03:26 PM	#10
Mmorgan32 Registered User Join Date: Jul 2013 Location: Fresno, ca Posts: 303	Re: Reducing unwanted heat in cab My truck is missing the compressor and bracket and the lines that go to the bracket. I'm considering doing an ac delete panel( but keeping everything) and on day doing vintage air. Has anyone done the delete panel? Do you think it would help? Mine as soon as I start driving hot air just blows in. Is there a valve that's open that I can shut and if so where is it? __________________ 1972 gmc c15 short bed... Sold 1970 chevy custom camper patina daily driver



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