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How do you fix ac on Ford F-250 so it will blow out ac vent isnstead of defrost vent?
Wiki User
∙ 12y ago
I had a problem with an f-250, year 2000, not long ago. well, one among several.
Vents default to defrost if there's a vaccum problem. Where I found the problem was under the hood, up high, firewall side of the battery. There's a platic container there which I think is a vaccum reservoir. The problem wasn't there but in a device mounted next to it (about 2"x2" in size with a small diaphragm and 2 vaccum hose on it. I think it's some sort of regulator for the vaccum controls to the 4 wheel drive locks. Anyhow, that thing wasn't working right for whatever reason, must have had an air leak. I replaced it and the vents worked in all positions.
If you want to test to see if that is the problem take the hoses off and plug them (I used a small stick) or if you have 2 people have one person hold finger over the hose and someone else check to see if the vent moves to other positions.
I just tried the above solution but instead of buying a new part I hit the mentioned diaphram with a small 2x2 stick and it started to work. I will let you know if it continues to work.
Wiki User
∙ 12y ago
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