Buick Repair Questions? Ask a Mechanic for Answers ASAP
good morning my name is ***** ***** I will assist
open the hood and make sure both heater hoses are hot at normal operating temp. if they are. it sounds like the blend door motor may have failed in the cold position. if only 1 hose is hot, then the heater core is clogged and needs to either be flushed out or replaced.
under the dash. if you have single control for both sides, it is on the drivers side above gas pedal
it is possible but a lot of times it does not work and the heater cow needs to be replaced. you can have it done to try. make sure the flush is a power flush not just changing the coolant. it needs to have pressure run through the core both ways to try to clear the clog.