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Old 02-14-2012, 01:17 PM
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GearHd6 GearHd6 is offline
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Well to me it sounds like either the heater core has plugged up or your heater box diverter/blend door has broken. If it's cold outside where you are that might be why you're thinking the A/C is staying on. It's an older truck so I guess anything is possible. Pop the hood and look and see if the inner part of the A/C compressor pulley is turning or just the outside where the belt is riding.

If the A/C compressor is running full time that will explain your loss in gas mileage. But there is no reason anything to do with the heat should cause a loss in mpg.
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