98 Ultra Heater Issue

My heater is somehow blowing warm air on the driver side but cold air on the passenger side and rear. Anyone have any ideas what would cause this and how to fix?

Thanks

Roger

I don't know exactly but there is a way to get the temperature control unit to feedback some codes. The codes may narrow down the problem for you.

My heater is somehow blowing warm air on the driver side but cold air on the passenger side and rear. Anyone have any ideas what would cause this and how to fix?

Thanks

Roger

The PA's have the switch on the passenger side that controls the air temp to the passenger. Try playing with that, it could be stuck or bad.