1999 F-150 4.6 triton engine A/C only turns off when panel selector is in off position

Asked by jrlarocque Sep 05, 2018 at 08:54 PM about the 1999 Ford F-150 XL 4WD Extended Cab LB

Question type: Maintenance & Repair

is it normal for the A/C compressure on a 99 F-150 to run continuously even
when the heat or vents are selected ( A/C clutch will not disengage unless
switch for Vent, Floor, window or panel selection is in the off position) A/C
works fine but runs all winter not allowing cab to warm up properly
Question, how to fix it ( problem seems to be in the Vacuum module or
vacuum lines

1 Answer
74,390

OJ answered 6 years ago

The compressor should only turn on if AC is selected. Make sure the knob for temperature is turned to hot/warm, AC not selected, and check again. Could be a problem with the control panel on the dash. Google how to check AC controls on net. To involved to explain here.

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