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Blower resistor Or possibly bad Vbc if aftermarket part Had that happened on different vehicles trying to save a buck Bought the better or OE part and problem solved.
this sounds like a bad blower motor resistor board that has gone bad. they are designed to work only on high if they go bad so you will still have the blower to defrost the windows.
The blower resister is near the blower motor,mounted on the outside of the blower box,but actually goes inside the blower box.It~s function actually is to give the blower motor lower speeds.If it is only working on high,then this is the problem.If it works on high when you select a lower speed,then there is a high blower motor relay that is stuck in the closed position .Replace the relay.
The picture I will try to attach will show you the blower motor housing. The white electrical harness rt hand upper corner is attached to the blower motor resistor. If you have checked the relay and its working ( you can check with a tester) the resistor is probably the problem. It's the most common a/c blower issue I see weekly hope I can send it and hope it helps.
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