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A/C stops blowing when accelerating???

mputnam on Thu September 06, 2007 7:08 PM User is offlineView users profile

Year: 1999
Make: Ford
Model: Explorer - Eddie Bauer
Engine Size: 4.0 SOHC
Refrigerant Type: 134
Country of Origin: United States

Ok, so this is a little weird. A few days ago my a/c started shutting off when I accelerate. I live in a very "hilly" area so when you set the cruise the engine gets a workout. I noticed that when the vehicle started up an incline and the engine started to rev, the a/c would stop blowing out of the dash vents and only came out of the floor vents. The rear a/c vents weren't affected. They stayed on the whole time and were just as cold as ever. As soon as the vehicle reached the top of the hill, the a/c came out of the dash vents again. I tried it with the max a/c on, with the auto climate on at several different temps, at different outside temps, and also accelerating on flat ground and even downhill. EVERY time the engine is under load the airflow through the dash vents is completely shut off. This has me completely confused. I don't even know where to start with this one. I visually inspected the system and saw nothing except for a small crack in the fan housing where it bolts to the firewall. Any ideas what this could be??? I'm lost and it's too hot for this.

Thanks in advance.

Chick on Thu September 06, 2007 7:15 PM User is offlineView users profile

You have a bad vacuum hose, vacuum resivior or bad one way vacuum valve (forget whats it's called vacuum check valve?) but you're you are losing vacuum when you accelerate. I wopuld also check the vacuum resiviour for cracks, rotted hose, or broken plastic hoses.. Even check where the vacuum attaches to the control head..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mputnam on Thu September 06, 2007 7:41 PM User is offlineView users profile

Well, sounds good to me. Now, I'm no mechanic, actually in med school at WVU, so some of these things are a little out of my area of expertise. Is this something that I should take it into the dealer to have serviced, or to another shop, or should I attempt this one on my own? I saw where the tubes come to the control head in the dash, and they all look good. But in the engine compartment is another story. Too many lines and hoses. I appreciate the help.

Chick on Thu September 06, 2007 8:43 PM User is offlineView users profile

Well, give it a shot yourself. Start from where the vacuum starts..The engine. Should be a vacuum diagram under the hood, but just trace the lines looking for a dry rotted, or cracked vacuum line..Take your time and follow the lines until they go into the firewall. There might be a "sphere" which is a vacuum check valve in the line, not sure if your car uses one..But if you find one, test it that air flows only one way..Otherwise keep checking the lines..Some may be plastic, others rubber...Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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