Question about 1998 Ford Expedition

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I need some help to understand what is happening with the a/c of my 1998 Ford Expedition; when it's parked the A/C works perfectly at any level; but when running, when acelerate over 40 miles/hr the A/C sounds like something is obstructing the ducts (air is still there but sound like obstructed); when remove the acceleration the A/C is back; so basically sounds obtructed only when accelerate. Any ideas?....Please advice Abraham_Hema@hotmail.com

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  • abraham_hema Oct 26, 2010

    Hi DocPlayer, you were absolutelly right!....I found a broken vaccum hose which is closed to the condenser; I just put again the hose on right position and the problem gone. thanks a lot for your help! A

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Yes, this sounds like your heating system may lack vacuum. The system is designed to fail in the defrost mode. Some vehicles shut down ac compressor under heavy acceleration, but you did not mention heavy throttle.

So, look for vacuum leaks, you may need to install a vacuum reservoir. You may have engine performance issues, causing low manifold vacuum, you may have a check valve that failed, so under acceleration, the vacuum is not shut off, but rather evacuated into the engine...

Posted on Oct 15, 2010

Testimonial: "Thanks a lot for you help, I found a broken Vaccum hose; just plug it back and the problem gone!....A+++++++++++"

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1998 Ford Expedition when it's parked the A/C works perfectly at any level; but when running, when acelerate over 40 miles/hr the A/C sounds like something is obstructing the ducts (air is still there...


Hi, this actually sounds like your heating system may lack vacuum. The system is designed to fail in the defrost mode. Some vehicles shut down ac compressor under heavy acceleration, but you did not mention heavy throttle.

So, look for vacuum leaks, you may need to install a vacuum reservoir. You may have engine performance issues, causing low manifold vacuum, you may have a check valve that failed, so under acceleration, the vacuum is not shut off, but rather evacuated into the engine...

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THNX

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