Air Conditioning problem
1988 Lincoln Town Car V8 Two Wheel Drive Automatic 62,000 miles
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WHEN THE CAR IS IDELING THE HEAT AND A/C WORK GOOD. WHEN YOU START TO DRIVE THE HEAT TRANSFERS TO DEFROST, THE SAME WITH THE A/C. I HAVE CHECK ALL VACUME LINES THAT I CAN SEE, EVEN UNDER DASH AND ABOVE DASH ALL THE VACUME LINES ARE CONNECTED. WHAT IS THE PROBLUME!

The problem is the vacuum supply line or the reserve tank under the hood! Check the thin black line that goes into the car, it has a break in it between the check valve or the reserve tank and manifold where it is supplied...one of these three parts is leaking...