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I had this problem on a 1994 Buick LeSabre after getting some work done. I could get a temporary fix going most of the time by running the temperature controls up and down a couple of times once the car warmed up. But what really think fixed it was this: One warm January day a friend and I were out driving around and stopped at a few places. We were driving around with the heating/cooling system off. So the car got turned on and off a lot that way. The next day, when it was once again on the colder side and I needed the heat, I found out that it worked like it was supposed to. So I have to surmise that cycling the power with the heating/cooling control off reset everything. Try it and see if it works for you...

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Q: On a 1993 Buick LeSabre the passenger heat and cool control lost power so you have heat on driver side and cool on passenger side how do you fix it?
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