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Engine heat on 82?

Rmodeler

Well-known member
Joined
Oct 2, 2005
Messages
57
Location
Goshen, Indiana
Corvette
'82' Silver Blue
I've by-passed the heater-disconnected the hoses. I still get a lot of heat coming from under the dash. I know that engine heat can be the cause of some of it. I have the heater controls shut off. Is there vent louvers under the dash that could stay open that would let excess heat from the engine in. Could there be a problem with the control, even though it is shut off and the heater core disconnected?
 

bill81vette

Moderator
Joined
Jan 17, 2004
Messages
4,321
Location
Troy,NY
Corvette
1981 dark blue metallic
how insulated is the floor of your vette???
I.E.do you have extra insulation under your carpets??you might want to consider some if you don't have any already...:beer
 

6880 Mike

Well-known member
Joined
Jun 30, 2006
Messages
2,723
Location
The Bluegrass State
Corvette
1968 convertible; 1980 L-82
C3s tend to be warm in the footwells. It's called Fish Feet and it's common.

The most common culprit is the hot water control valve sticking open, but you've already taken care of that.

Check to ensure AC flapper door at the cowl is closed and vent door behind the right kick panel is closed.

Check to ensure all the various grommets in the firewall are in place and sealed.

Check to ensure you don't have an exhaust leak.

Check to ensure the factory heat shielding is in place.

:)
 

jdp6000

Well-known member
Joined
Aug 23, 2004
Messages
646
Location
Aurora, Ontario, Canada
Corvette
1982 CROSSFIRE
The core box has a flap that switches distribution from the hot side to the cold side. The cold side blocks of the the heater core and allows air to come in from outside. The problem is if the air out side is 90 degrees the air coming in is also 90 degrees.

Jim
 

LVMYVT76

Well-known member
Joined
Apr 21, 2006
Messages
664
Location
springfield, mo
Corvette
1976 medium blue
You need to check the seal on the back of the hood. If the seal is gone or bad, this allows engine heated air to be sucked in when the outside vent is on. Also where the heater hoses hook there is a foam section betwen the heater core pipes, this sometimes rotts away and allows heat to come thru the a/c heater box. also if you have a/c, the box it self has seals and these aslo might need redone.
 

Evolution1980

Well-known member
Administrator
Joined
Feb 25, 2002
Messages
4,302
Location
Cleveland, Ohio
Corvette
ZZ4, 700R4, Steeroids rack & pinion, VB&P Brakes
Nope, it's just naturally hell's furnace down there. Get used to it! :L When I go on long drives (more than 2 hours), I wear flip flops. Otherwise, my feet roast/sweat. I also leave the blower set to "defroster" and "cold". That helps keep some of the heat from going down there.
 

Rmodeler

Well-known member
Joined
Oct 2, 2005
Messages
57
Location
Goshen, Indiana
Corvette
'82' Silver Blue
Thanks for all the input. I'm checking out some of suggestions. Do you think this was a problem when the cars were new? If not, how can it change so much? I haven't got my a/c working yet($500+), but if it was, would it override the heat problem?
 

6880 Mike

Well-known member
Joined
Jun 30, 2006
Messages
2,723
Location
The Bluegrass State
Corvette
1968 convertible; 1980 L-82
...Do you think this was a problem when the cars were new? If not, how can it change so much?...

Yes. Astro-Ventilaiton never actually worked the way GM envisioned it, so cabin heat was a problem from Day 1. Somewhat less on newer cars because all the factory sealing and heat sheilding was intact and/or new. Over time, heat shielding gets removed and not replaced, grommets and AC/heater boxs get removed and reinstalled, etc. Lots of folks install additional heat/sound barrier material under the carpets.

... I haven't got my a/c working yet($500+), but if it was, would it override the heat problem?

Override? Yes, some, but not completely.

:)
 

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