The walls Are Twice as Thick as Original GM Part# 3963756
Question: What do you get when you mix thin gauge plastic with radical temperature shifts from hot to cold and back again? Answer: Warping and cracking!
In the auto restoration industry, there has been a history of scrapping OEM A/C Defrost Duct in vintage ’70-’72 Chevelle, Monte Carlo, and El Camino models because the duct had snapped off flimsy mounts, or developed cracks. So our engineers decided to develop our own replacement duct and while we were at it, figured we could address the hot/cold warping issue head-on.
Your A/C defrost duct sits up against the firewall, right behind the engine. As a result, these ducts tend to warp and crack. As a result, they tend to lose air through cracks and gaps, and once removed, they are difficult to install properly.
That’s why when we engineered our Part #02-220 we gauged the plastic twice the thickness of the original duct. This new, drop-in replacement for GM part #3963756 gives you confidence that the duct will last whether it is going into your own daily driver or a customer’s vintage car. This fits 1970, 1971, and 1972 Chevelle, El Camino & Monte Carlo that came with factory air conditioning. It also fits non-a/c cars in the same model/year range.
The Original Air Group at Classic Auto Air offers many A/C Defrost Duct replacement parts for vintage auto air conditioning systems. Many are direct replacement components, but we do improve on design when we engineer and manufacture whenever possible.
Classic Auto Air’s Original Air Group specializes in cars originally equipped with factory air-conditioning. This includes part and system restoration services, new, used, and restored replacement parts, and system upgrade kits for 1980’s & older Ford, General Motors, and Mopar cars & trucks.
Call us today to get set up as a dealer or to buy components. We are always ready to help. Stay cool and happy motoring!
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I woulsd be interested in this and other related A/C parts for the ’70 chevelle w/big block.