There sure would never be anywhere to hang a unit under the dash on an SL.

Just because the face of the console looks like A/C controls doesn't mean it was factory installed. it is an important question to ask your tech. If the car has Climate control it undoubtably was a factory install. If it was manual A/C then the fact and most all aftermarket used the same console controls. The problem has to do with how they installed the evaporator.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician