A/C or Blower question
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A/C or Blower question
I have an 89 Ford Bronco 302. My question is about the A/C. The A/C system was converted to R134 by the previous owner. When the A/C is set to MAX and I hit the gas the A/C stops blowing. When I come off the gas or get to speed it will start blowing. Everything works right when set to MIN A/C all the time. What the heck is going on??!
Junior User
Joined: Nov 2003
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From: Omaha, NE
Originally Posted by badlaw187
...When the A/C is set to MAX and I hit the gas the A/C stops blowing.(Mine goes to the defrost vents) When I come off the gas or get to speed it will start blowing. Everything works right when set to MIN A/C all the time...
Any help appreciated!
Posting Guru
Joined: Sep 2002
Posts: 2,195
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From: San Antonio, Texas
The vaccum check valve or the vaccume canister is leaking.
When you engine is accelorating, it creats no vaccume for acelorating and thats when the check valve and canister kicks in.
The canister and check valve should be on the pass. side and the valve shouldnt be far from the canister, you can follow the lines to it.
When you engine is accelorating, it creats no vaccume for acelorating and thats when the check valve and canister kicks in.
The canister and check valve should be on the pass. side and the valve shouldnt be far from the canister, you can follow the lines to it.
Posting Guru
Joined: Apr 2005
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From: Longview, TX
If you don't have one get a MightyVac and check your vacuum lines. I had a bad hose and a bad check valve. The A/C never quits now. The check valve holds the vacuum on A/C components even though the engine vacuum drops under heavy throttle.
Senior User
Joined: Feb 2006
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From: Gaithersburg,MD
On the passenger side fire wall right above the blower there is an actuator with a white vacuum hose. Check the hose for leaks. I just had the same problem. When I would get to 50 MPG, the air would switch from the panel vents to the floor and defrost vents. I searched and found a thread that said to check the vacuum hose. Mine had a hole in it and I wrapped black tape around it. I took it for a test drive and it's now blowing fine. I'm going to put a new peice of hose over the old one when I get a chance. If it's not the vacuum hose it could be your check valve..
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Joined: Nov 2003
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From: Omaha, NE
ok, guys, check valve fixed it for me! Thanks everyone for the help!!
Motorcraft part # D70Z*19A563*A. Also says YG193 on the box. It has an extra outlet that had to be capped, no big deal.
I also found the white line that 93Mule mentions split, fixed it first, no change, the check valve was the problem.
Motorcraft part # D70Z*19A563*A. Also says YG193 on the box. It has an extra outlet that had to be capped, no big deal.
I also found the white line that 93Mule mentions split, fixed it first, no change, the check valve was the problem.
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