Question about 1998 Ford Expedition
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
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Posted on Jan 02, 2017
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