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Q:

my heater blower only works on high on 1999 Plymouth Breeze

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did the blower motor cause the blower motor resistor to burn out .this is what I was told happens and that I should buy Both or the resistor will just burn out again.
(2) Answers
I usually have been successful in replacing a resistor without replacing the blower motor, although, a shorted (drawing too much current) motor could burn out the resistor. I suppose you could power up the motor with clip leads to the battery, and see if it runs well. If so, it's probably not shorted. If the clip lead wires melt, then the motor's probably shorted.. Don't burn your fingers..
if the blower motor is on a closed loop whenit is supose to be open, then it will short out the relay. have both replaced