Hello all,

I have a 93 190E 2.3L and I was wondering, how does one test the heat
exchanger sensor on the plastic heater motor cover??? This sensor
sends an input signal (resistance) to the climate control for heating
and cooling. If I find that it's defective where and how much does
one of these things cost. I looked online for the part and could not
find it at Benzbin.com or bimmerparts.com