my 2000 C230K heater blower will not go off even after the car is turned off. We tested the relay and the heat goes on and off by the switch but the blower is on a constant high. Is it the regulator? Please help, its starting to get cold.

 

you nrrd to take it to the dealer to read the fault code.

it could be from evaporator temperature sensor to the A/C control unit itself.