My '84 has the Tropic Air dual evaporator system and seems to be wired as sort of a hybrid between the 84-86 system and the later 86 dual fan Behr system. (As per the service updates) In the Tropic system there is a solenoid beyween the dryer and the aux evaporator this is show in the wireing diagram for the system. (I have this solenoid.) The later Behr syetem does not have this solenoid. As I am rebuilding my car, I am updating the compressor, condensor, dryer and makeing new hoses. Any reason to leave the solenoid in the system?