heater/ac on 2003 Dodge Durango

heater/ac only works on high

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2 answers
Probably the blower motor resistor has failed, Looks like $26 at the parts stores and about a 1/2 hour to an hours labor to replace depending if you have a rear heater system also.
Yeah, before mine quit working all together, it would only work on high, in fact all three speeds were the same.