Why does my A/C fan blow only some of the time? on 1999 Mercedes-Benz C230

One never knows when it will cease to blow. No reason. Just stops blowing when driving or starts a few minutes after the car starts. Weather does not seem to be a cause nor does humidity. Happens on heater as well as AC.

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2 answers 3 comments
check for corrosion at the resistor
Thanks...where is the resistor?
Blower motor resistor is located by the blower motor itself.
Thanks. I'll tell the mechanic. You have been very helpful.
also ck wiring at plug yjey tend to melt