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  1. Bb69gts

    Heat turns to cool air on the highway. 69 GTX convertible.

    Hello forum members. new at posting, so please be patient. I have rebuilt my 69 GTX convertible, AC car. Everything works as expected, A/C, Heat, Defrost and blower, but as we get to highway speeds, say 60 MPH and above, my heat quickly turns to cool air. I don't know if I am losing vacuum...
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