when heater fan on,will only run on low, when increased ,cuts out.

10/4 thanks for info but still can,t find out if only the resistor can be replaced or the whole motor, tried local auto electrical shops but they say they can only get the motor by ordering from toyota and do not know if its just replacing the resistor without a strip down. And as usual the price is ??? Ever felt you are going in circles. ???

ebay has several of the resistors for sale!!!... Check it out...