Dutchdarrin1

I'm on my second '73 Corvette. This one has is a convert with AC. What type of air output should I expect from the vents with the AC on? At present, I'm getting very little flow (by modern AC standards that is). At high, I can "feel" the air at about 18" away from the vent but that's about it. At the vent, the air is very cold. I'm wondering if I have an obstruction or if the fan isn't at full power. Or if that's as good as it gets.

Your experience is appreciated.

Dutch.

htown81vette

I think that's about as good as it gets. But there is a C4 blower mod (replace the C3 blower with a C4 blower) and you get alot more air. I've not tried it yet, but definitely intrigued.

The modern systems are way more efficient.

htown81vette

Check out my thread that I posted earlier this week, it has some good info on what is needed for the C4 blower mod:

https://www.corvetteforum.com/forums...-has-died.html

REELAV8R

Yes that is all you get with the stock fan. Sealing foam on the ducts could also contribute to the weak flow.
I converted to the c4 fan and it is 100% better now for air flow.

Jud Chapin

You could have obstructions in the evaporator casing which is fairly normal with C3 as leaves, etc., are suck in thru the air vent blocking air flow. There are many threads on this problem so do a search. The bottom line is the a/c in your Vette should be able to cool the interior down fairly quickly (top and windows up) and the temp at the vents s/b around 40 degrees at 1500 rpm's. I live in FL and my '76 keeps the car cool at the height of summer.