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Originally Posted by randle2318
...The fan blows when on defrost, but not heated air. On all other setting no fan, but I can hear the valves switching to panel or floor. Please help me.
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This could be a fan problem, with worn brushes that only allow it to run a full speed. It could be a bad Control Unit, not signaling the fan to run except in Defrost.
The switching you hear is probably the solenoids that apply vacuum to the various air flaps.