There was a "programming" update that we did to those climate control units BUT doubt that anyone at dealer would remember how. SERVICE campaign bulletin # 95-0801 August 1995.
Replacement is simple & takes about 30-45 minutes.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)