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Q:

heater/ac on 2003 Dodge Durango

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
heater/ac only works on high
(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.