2002 Toyota Highlander

Heater problem
2002 Toyota Highlander 4 cyl Four Wheel Drive Automatic 165000 miles

the temperature control switch responds or doesn't respond in a inconsistent way. The heat will not come on in the heat range (red) and the a/c wont come on in the blue range. I find the heat by moving the switch up and down the dial. The same with the a/c. The heat/ac will run for time then stop. Its getting cold. HELP!
October 19, 2009.

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