when i hit any of the fan speeds , nothing happened, i hear it under the hood, when i heat difrost, it should go to high fan and it does not.
could it still be the [ evaporator temp sensor. thanks for you help. i used the search and im not sure if this is the problem, after the search
mike

I see you're new here; welcome to the forum.

It would be super helpful when asking a question to state what car, year, model, engine, etc, etc.
I'm assuming its a Benz, but the HVAC/blower system in these cars differs by model and, in some cases, by year.

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KenP

1996 S500 W140 Coupe

i was tired ,, its a 1991 500sl