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Usually when the heater only works on high it is because the resistor has went bad. The resistor is what put resistance on the fan to make it work on low, medium, and even off. Since the resistor is bad it only works on high because there is no resistance needed. The resistor part you need should not be expensive at all, I just replaced mine in my Jeep Wrangler and it was only 35.00 at Auto Zone I believe. All it is, is a plug that you will put in instead of your old one. It should be back behind your glove compartment or under the lower side if the passenger side of the dash. Good luck!
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You have a bad blower motor resister.........
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