Vents cut out when accelerating

GT40 2 · Jul 24, 2008

The air vents stop blowing and blow through the defrost. So I replaced the vaccum motor that controls the panel vents. But it still blows through the defrost. Does anyone have any idea what I should try replacing next?

2BADSTANGS · Jul 24, 2008

Check all your vacuum lines make sure there isn't a leak. If you dont find anything wrong there check the selector switch amd make sure it seals and changes as it should.

RustBucket · Jul 25, 2008

There's a vacuum check valve that's failed. I can't tell you where it is because I've yet to change one on a Mustang

2BADSTANGS · Jul 26, 2008

On my '93 Gt the vacuum valves are on the rear of the passenger strut tower.

GT40 2 · Jul 26, 2008

What do the vacuum check valves look like?

GT40 2 · Jul 30, 2008

I found some broken vacuum lines going to what I think is the check valve.

2BADSTANGS · Jul 31, 2008

Sounds like a step in the right direction, The vaccum check valves have two vac lines connected to them and 1 electrical connection there usually black and about 3in tall. Let us know if you get it fixed and what the problem was!

Jimmy2Times · Aug 10, 2008

GT40 2, did you find the problem? If so what/where was it? I'm having the same problem and so far have not been able to isolate the vacuum leak other than to verify that it's somewhere behind the dash, not under the hood.

GT40 2 · Aug 10, 2008

I replaced the vacuum thing on the right strut tower today, but it didnt fix anything.

2BADSTANGS · Aug 11, 2008

Does this problem only occour during acceleration, or if you let the car idle and warm up without accelerating will it still happen?

GT40 2 · Aug 11, 2008

It only happens during acceleration.

glowstang93 · Aug 11, 2008

That thing you replaced on the right strut tower is the EVR or Egr control valve, the computer tells it when to open or not. Of course it is upside down in the pic, lol.

GT40 2 · Aug 11, 2008

My EVR looks different from that one. What does the check valve look like?

Mustang5L5 · Aug 11, 2008

Is the A/C on when this happens?

GT40 2 · Aug 11, 2008

Mustang5L5 said:
Is the A/C on when this happens?

It doesnt matter, A/C on or off.

2BADSTANGS · Aug 14, 2008

Check out #58 on this page, I know this is a 5.o, but yours should be in relatively the same place. CJ Pony Parts - Ford Mustang Parts

GT40 2 · Aug 14, 2008

Mine has a vacuum thing there too.

GT40 2 · Aug 14, 2008

So I replaced it with another one I got from the junkyard, and it didnt fix anything.

GT40 2 · Aug 14, 2008

3. Vacuum Storage Canister - Stores Vacuum to prevent interruption of services during wide open throttle

Could that be the problem?

2BADSTANGS · Aug 15, 2008

It is definately possible. Have you checked the system for leaks? Sounds dumb, but you could pull vacuum lines and suck on them until you find one that dosen't hold pressure well, then inspect it. (If you dont want to anty up the cash for a real tester.) I think the vacuum canister is in the pass. fender. (Don't quote me on that though.) Also try the "stupid" test on the vacuum line going through the firewall near where the heater core hoses connect, because thats the one that provides vacuum to the vent selectors. If it's good, chances are youre problems elsewhere. Let us know what you find, 'cause this could happen to us someday.

Vents cut out when accelerating

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