Reed44

This is not about my mustang but my blazer. I just got the a/c fixed in my 95' blazer. It works great but when I get on the gas after a stop light or something, the vents switch to defrost. Then when I let off they switch back. Does anyone know whats going on here.

chupac

You've got a vacuum leak or your vacuum check valve is bad. Follow the hose to your vacuum canister, I'm willing to bet it's loose.

Reed44

Is that the massive ball connected to my hood?

5speedstang

i belive so

chupac

Exactly, follow that hose that's connected to it back to the engine.

Reed44

alright, I will try that

gt_stang101

My brother had a '97 Blazer and he had the same problem. I believe the problem was actually in the A/C switch itself. I'll ask him when he gets home and PM ya.

ben790450

Wow my mustang actually does that! Ive never really cared but i guess now i know what to look for. Pretty sad im an HVAC certified tech and i dont know how to fix that lol