My Air condition is changing between the Upper vents to the Floor vents. when I let off the Gas it switches back to the Regular Vents. but when I step on it to pass a car or just to mess around, it switches to the floor Vents.

I did a few searches and came up with nothing.

this car is a 94' Camaro Z28.

Please help!

Thanks!

 

Vacuum leak?

 

the check valve under the hood is bad

courtesy of shoebox

 

Thanks. I'll replace that badboy, see what happens.

 

This is a common problem that is discussed frequently. You must have not looked too hard or in the wrong places.

 

replaced check valve, didn't resolve issue. I have a 111 lsa cam, would that be the issue here?