Hello all,
Very bizzare problem in my 82 300SD. About one month ago, I lost most of the heat from my auto climate control system. Last year, heat worked 100%!
Checked the following:
Good coolant level Working mono valve Swapped temperature regulator (Silver relay box) Swapped push button panels (3x) Good fuses Good Aux water pump Even used an IR thermometer to check the temperature of the coolant at the hoses (temp good!) EVEN UNPLUGGING THE MONO VALVE DOES NOT HELP!
Heat 'kind of' floats out of the defroster vent, but is ice cold from the side vents.
It seems like something mechanical is the cause, vs. a problem with the automatic climate control. Any suggestions? Winter is around the corner!
Thanks! Matt