I have the same problem with only warm air coming out of the dash heater vents. I went a different way. I ran a heavy extension cord from the plug-in for the overhead tv (which is off of the inverter) down to the center console. I plan to use a small electric heater around 750-800 watts worth to warm up the front seats. If the coach is warm to start the small heater should keep us warm all day.
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