Recently I lost the ability to turn on the heat in my car except for the highest level of heat, so it
Answers from the Automotive Experts
Dear Angela,
When the blower motor only works on high it's usually a bad resistor.
Just like it's name, the resistor restricts power at different increments for the various speeds. On high there is no resistance. So, when none of the other levels work it's because the resistor is bad.
Hope this helps.
Lori Johnson