Cabin heat problems

Reply Subscribe

Thread Tools

Search this Thread

Oct 31, 2013 | 11:59 AM

CiCiC3

Thread Starter

Racer

Joined: Aug 2011

Posts: 429

Likes: 24

From: Charlotte NC

Cabin heat problems

I have a 74 BB with no AC but from what I hear it won't help much to add that feature. The cabin will just get too hot driving for a long period on a hot day with or without it. Pretty much all have the problem small or big block but there are some partial solutions. No real fix as I hear though.?

Oct 31, 2013 | 12:12 PM

MSGT-R

Pro

Joined: Oct 2013

Posts: 620

Likes: 117

From: Denver CO

You can put more insulation on the floor pan and firewall, and a coolant cut-off valve on the heater core.. Don't know if that would help (or you've already done it).

Oct 31, 2013 | 12:15 PM

Manuel Azevedo

Burning Brakes

Joined: Jan 2007

Posts: 1,057

Likes: 4

From: Concord Calif

Sounds like bull to me! My 68 small block will freeze you out!

Oct 31, 2013 | 12:25 PM

Roco71

Melting Slicks

Joined: Jul 2009

Posts: 3,264

Likes: 3

From: Vero Beach FL

If the car is functioning correctly the factory A/C is more than enough to cool the cabin.

Oct 31, 2013 | 12:29 PM

Easy Mike

Team Owner

Joined: Jun 2000

Posts: 38,923

Likes: 1,481

From: Southbound

Cruise-In II Veteran

I'm not sure what you're asking, but I had a 74 coupe with factory air and was always comfortable.

Slip some Reflectix under your carpets and you'll feel a difference.

Oct 31, 2013 | 12:37 PM

Roco71

Melting Slicks

Joined: Jul 2009

Posts: 3,264

Likes: 3

From: Vero Beach FL

If your seals in your duct work are not sealing (blend door) it will allow hot air into your ducts. I do not believe that non A/C cars have a hot water shut off valve but you can add one manually inline to eliminate water flowing to your heater core. The there is the hood to cowl seal, is it in place? As Mike said installing heat insulation will help a bunch.

Oct 31, 2013 | 12:40 PM

CiCiC3

Thread Starter

Racer

Joined: Aug 2011

Posts: 429

Likes: 24

From: Charlotte NC

Adding AC may help! Alright that's good to hear. Now keeping the engine cool enough with it running becomes a threat but may not be so bad. Thanks

Oct 31, 2013 | 12:45 PM

CiCiC3

Thread Starter

Racer

Joined: Aug 2011

Posts: 429

Likes: 24

From: Charlotte NC

Quote:

Originally Posted by Roco71

Yeah I had to remove that for high rise manifold and other custom parts. Ok that could be key to the problem and realize the importance of it now. Thanks

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Joe Kucinski

8 Coolest Corvette Pace Cars (and Replicas) of All Time

Verdad Gallardo

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Joe Kucinski

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Verdad Gallardo

Top 10 Corvettes Coming to Mecum Indy 2026!

Brett Foote

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Michael S. Palmer

10 Revolutionary 'Corvette Firsts' Most People Don't Know

Joe Kucinski

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Michael S. Palmer

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Joe Kucinski

10 Most Common Corvette Problems of the Last 20 Years!

Joe Kucinski

Oct 31, 2013 | 12:49 PM

Roco71

Melting Slicks

Joined: Jul 2009

Posts: 3,264

Likes: 3

From: Vero Beach FL

Quote:

Originally Posted by CiCiC3

Yeah I had to remove that for high rise manifold and other custom parts. Ok that could be key to the problem and realize the importance of it now. Thanks

Without that seal hot air is coming from the engine bay into your cowl and right into your fresh air vents. That seal is all of about $8 or less. Major contributor to your problem.

Oct 31, 2013 | 12:55 PM

#10

MSGT-R

Pro

Joined: Oct 2013

Posts: 620

Likes: 117

From: Denver CO

Yeah, that would make his car like August in the Southwest alright!

Oct 31, 2013 | 01:13 PM

#11

CiCiC3

Thread Starter

Racer

Joined: Aug 2011

Posts: 429

Likes: 24

From: Charlotte NC

Quote:

Originally Posted by Roco71

Without that seal hot air is coming from the engine bay into your cowl and right into your fresh air vents. That seal is all of about $8 or less. Major contributor to your problem.

That sounds like you hit the nail on the head, I forgot about that detail and that is where most of the heat is coming from the vents. Thanks