patrol gr 1992 y60 without air conditioning 40-50 C and the ventilation does not want to be correct. I changed both fuses for the motor (under handschuffach), the cables to the motor relocated (were smeared). lueftung does not function at 1,2,3 only at 4 and then I probably fly after a short time through the fuses again. where must I look, what replace / prunes