A/C vacuum problem
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Joined: Mar 2003
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A/C vacuum problem
I have an 89 F150. The air conditioner works rather well until I accelerate heavily or if I'm putting a strain on the motor like hills, passing, etc. When I have the ac blowing out of the dash vents and put a strain on the motor, it switches to defrost and then switches itself back once the strain on the motor is over. I can hear it all going on (sqeaks at the diverter), but I don't know what to do about it. There are a few vacuum lines under the hood that are no longer hooked up (previous owner) but I can't find a vacuum diagram or anything else helpful in the Chilton's manual. Thanks for your help. I know it's not a compressor problem because it continues to blow, just out of the defrost. This is definetly a vacuum problem.
Garrett
Garrett
Laughing Gas
Joined: Mar 2003
Posts: 877
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From: Colorado, U.S.A!
A/C vacuum problem
Might be something to do with the vacuum reservoir. Either it's leaking or the vacuum line to it is broken. That's what supplies vacuum for the A/C doors or diverters or whatever when engine vacuum is low. Should be either a black plastic ball or a large black tin can under the hood somewhere.
Did you check for a vacuum diagram sticker under the hood?
Did you check for a vacuum diagram sticker under the hood?
New User
Joined: Jun 2003
Posts: 14
Likes: 0
From: Jacksonville, FL
A/C vacuum problem
mb112
I had the same problem. Whenever I would go over one of the larger bridges here in jacksonville, mine would divert. I found the vacuum line to the air baffle on the passenger side of the engine compartment had deteriorated. I replaced it, and all is good. My air from the vents is colder as well. I guess I was getting too much outside air through the supplly.
Also, my buddy with a 95 F-150 has the exact same problem as you and I. We have not found the cure yet. I'll keep you posted if we find it.
Like c96drumm said, there should be a diagram under the hood. Mine is color coded to match the actual lines on the engine.
Good luck
Shawn
I had the same problem. Whenever I would go over one of the larger bridges here in jacksonville, mine would divert. I found the vacuum line to the air baffle on the passenger side of the engine compartment had deteriorated. I replaced it, and all is good. My air from the vents is colder as well. I guess I was getting too much outside air through the supplly.
Also, my buddy with a 95 F-150 has the exact same problem as you and I. We have not found the cure yet. I'll keep you posted if we find it.
Like c96drumm said, there should be a diagram under the hood. Mine is color coded to match the actual lines on the engine.
Good luck
Shawn
