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It may be that you have a vacuum leak. In some models of GM cars the AC controls are controlled by vacuum. At idle the vacuum may not have enough suction to hold a control in the desired position. When the situation happens, place the transmission in neutral and increase the RPM. If the AC blows cold then the vacuum may be the problem.
Check for a fuse that indicates radio and replace it if it's burnt through or melted or discolored. The Buicks have dash controls that require expensive repairs sometimes to get the temperature controls to work so some people jump around the controls by installing a separate toggle switch that directly turns the AC unit off and on for 92 through 94 Buicks. Any AC shop can install the bypass wires.
take it back to whomever did the repair and have them fix for free. I suspect the new sensors are wrong, installed wrong, or something else. These sensors tell the brake and traction control computers what to do.
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