I have a 1993 190E 2.3L and the cabin does not get very hot even with the dial set all the way to full heat. The auxiliary water pump, monovalve and thernostat were all changed and the problem is still there. I have forward/reverse flushed the heater box and the problem went away only to resurface again.
Any ideas on what the problem is?
Do I need to change the heater core?
Chris