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Thermostat,heater core,temp control fine. I'm thinking the heat door is stuck. Where is it located?
It should be data scanned before replacing to verify. It is located on the right side close to the blower motor, and left of the blower.
Common Problems > Buick LeSabre
Q&A > Buick > 1996 Buick LeSabre
Q&A > Buick > 1994 Buick LeSabre