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Heater control wasn't working due to blown fuse. Narrowed it down to the pressure transducer (switch on the smaller of the ac lines). Changed it and fuse didn't blow. After a bit I tried getting the ac to work. Was adding refrigerant and fuse blew. Tried another fuse with the same result. If I unplug the transducer everything except the ac works and fuse doesn't blow. Anyone have any idea where I go from here?