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A/C 1980 C3

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sirfixalot:
i have a high-density foam with foil in my c3.   C4  I used a similar adhesive similar to dynamat, and also high density foam also fabricated aluminium panels to fit under floor, up toe board and into trans tunnel. Secret is to insulate high up on firewall and also block and seal all holes in firewall

blackleroy44:
Interesting,I take it that the foam and foil will still fit under the carpet without any bother, how thick is the foam you used in the c3?

Vettech:
I had to re-read, but you said rec/drier, and for some reason GM went backwards to a P.O.A system with Expansion Valve.
My 78 has a factory CCOT system whilst my 87 & 90 also have CCOT. (C4)

Expansion valves or at least externally adjustable ones allowed you to set the temp of air out of the vents, whilst CCOT  rely on mixing hot & cold air for the desired effect. Both systems have their devotee's.

As Sirfixalot says, you must ensure no holes in the fire wall. As soon as the car gains forward motion, a reduced air pressure or partial vacumm is created within the cabin, which will suck the red hot engine bay air directly into the cabin and you will then complain like many corvette owners before you, that Corvettes are mongrel hot cars to drive.

STD from the factory they are insulated, underfelted and carpeted. There are also sneaky bits of closed cell foam blocks & strips that seal around the radiator, the transmission to trans tunnel gap etc. Once your A/C is running and the car sealed you will be driving a cool quality muscle car and enjoying it.

I used similar material to Sirfixalot, a thin insulate with al-foil backing, self adhesive with peal off backing, easy to use, cut and shape and mold around everthing. When I first did my 78, I sealed 30 odd firewall holes (fglass epoxy), then did the insulation, underfelt and carpet, the car transformed overnight, restoring the A/C was the icing on the cake, no more foggy screens etc.

P.S some early Comodore (VB ~ V?) Parts like the Dash controll are either direct replacements or have similar parts.

Cheers.

blackleroy44:
Vet tech, thanks for your reply. I’m “refurbishing” the 80 bit by bit slowly as finance allows. Suspension and most Mechanics have been seen to, windows are being done and full set of new carpet arrived yesterday. I’m still deciding what insulation (sound and heat deadner) to put underneath the carpet. I was thinking of Superlight Dynamat, self adhesive, for sound and one layer on top of that of Reflectix for the heat. Holes etc in the firewall is certainly on my list.
I am thinking that the thin insulate that you and Sirfixalot used would be similar to the superlight dynamat, easy to work with and self adhesive?
I’ll keep you informed as how things turn out. I’m still going with the Vintage Air con. Kit, started removing the old, non working factory air.
Open to all suggestions, Cheers.

blackleroy44:
Vettech what’s your opinion of the “light”   Insulation that I was considering using on my 80? Do you consider that there might be something as good as or better avail in Aus.that I could use. I want something self adhesive and very plyable that I can fold around arwkward places all through car. I want to concentrate on complete floor, doors and firewall doubling up on firewall and tranny’ tunnel. As you might have worked out this is my first Vett and never having to insulate any classic vehicle before, I like to ask more experienced persons such as you and others,(sirfixalot),for there valued opinions and suggestions
Regards.

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