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Heater System Does Not Operate
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Blower motor fuse
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Replace fuse.
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Blower speed switch
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See your authorized dealer.
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Wiring harness
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Check wiring harness. See your authorized dealer.
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Heater Does Not Warm Interior of Cab
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Air filter clogged
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Clean or replace filter.
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Heater hose kinked, pinched or collapsed
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See your authorized dealer.
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Heater coil fins clogged with dirt or dust
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Clean heater fins.
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Blower motor failed or operating too slowly
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See your authorized dealer.
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Heater valve remaining closed
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See your authorized dealer.
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Temperature control switch
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See your authorized dealer.
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Interior Windows Continue to Fog
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Cab air filter clogged
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Clean or replace filter.
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