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How do you fix a 1998 Mercury Sable if the AC stays on when heater is turned on?


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Wiki User
2015-07-15 19:13:56
2015-07-15 19:13:56

cars that are equipped with ac are supposed to run when the heat selection is on : max a/c , a/c , mix or defrost. the ac pump dries the air that flows through it which helps to clear the windshield and also to help to feel cooler in the summer . i have pulled the plug on the compressor before to turn it off during the winter months but it is just fine to run

Also, heat settings keep the compressor running to prevent it from seizing. The number 1 cause of compressor failure was due to lack of use during the long winter months.

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replace the heater temperature switch

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This question was for a 1998 Mazda 626. The solution to this problem of the temp heating up is to start the heater in the car on high. Then it immediately goes to the neutral temp for the car, and stays in stable there.


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