YAYITSJEWDAY87

yesterday my car blew really cold ac and this morning i go to turn it on and it dont blow out the vents it blows oout where the defrost come out any one know why

mustangcat

Is this set on the Defrost setting?

khooper

This occurs because the climate control doors(that direct the ventilation in the car) are vacuum operated, using intake manifold vacuum. The default(no vacuum) position directs the air to the defrost outlets. When you accelerate, the manifold vacuum drops below that required to operate the doors, and whatever you've got the temp set at blows out of the defrost. When you take your foot off the pedal, (or release the cruise control) the vacuum quickly recovers and the ventilation returns to normal. This is a design flaw, as far as I can tell, there is no fix.
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jwog666

sounds like you have a vacuum leak on the main line from the engine to the hvac assembly. the system uses a vacuum resevoir to store vacuum for wide open throttle condition so it should never go to the defrost setting unless comanded there or if there is a leak.

YAYITSJEWDAY87

i dont have that **** and sorry about the delayed responce and is there anyway i can trace the vacs to see if its leaking?

sand1303

i had the same prob. one time i have a 96 v6 when that happened to me there was a vacuum hose that i busted loose in the back driver side of the engine compartment. as soon as i plugged it back in the air dropped to the vents. there is a vacuum splitter or something right there that has three nipples two of them are suppose to have vacuum lines attached and one is plugged if they are connected follow those and see if they came loose down the line somewhere.

Angel001

When I turn the air condition off in my 2001 mustang, I hear a buzzing sound. The sound it like a digital watch alarm. It's only on a few seconds. However, this has never happened before. I'ts been going on for abouth a month now........please help



Angel.....

YAYITSJEWDAY87

can u post a pic of where the vacuam is located at i tried to find a leak but no can do