dcautomotive

I have a 1980 corvette at my shop. One of the complaints the customer has is that there is still air coming out by the floor when the AC selector is on vent or AC. The selector is working properly. When it's on defrost, it comes out the defrost, heat then the actual floor vents. What I noticed is that there are two 1/2" diameter holes in the air ducts going to both sides of the car, This is where is the air is coming out when you put it on vent along with air coming out the actual vents. Doing some research, this looks as if this is normal. Just wondering why there are holes in the air ducts? I don't remember see this on any other car.

Thanks for your help.

interpon

Could be switch not fully selecting
https://www.corvetteforum.com/forums...-switch-2.html

also note fan always runs even off

81c3

I noticed this on my 82 as well.... two holes about dime size on both pass and driver side blow air to the floor. I was going to put a small piece of duct tape or electrical tape over them to see if it would blow more air out of the vents... Then again, heat rises, so maybe cooling the lower air is what is intended....

Street Rat

I sealed all of the holes and put new gaskets on the connections. I also did the C4 fan motor upgrade. Car is a black ‘81. Getting more flow for sure. I don’t need cold feet though.

Craig

kanvasman

my all original 78 also has those holes. It makes sense to me since it directs air ( warm or cold) onto my legs/feet. if they are closed off the air will go to the lower dash vent and comet there.