Replaced ONLY the blower motor or both?

The fan speed should be adjusting by itself in AUTO mode, when it gets up to temp the speed should slow itself down. Maybe suggest that she alters the temp setting not the fan speed???

PS the master tech still has a flip phone and does not txt

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It came as a set. So both the regulator and motor.

I probably will put a tape overthe thing since she seems like the sort that thinks that if you push the button more, the elevator comes faster.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Was the replacement part MB original? IMHO, changing the blower speed frequently has no effect on blower motor/regulator service life. If anything, the pushbutton unit is doing more work.

I think so. Just puzzled why one motor fast after 400K and another one fails in less than 50k.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Better put tape on the steering wheel too. She is probably messing with that all the time also!!

Speaking as an electrical engineer (but not automotive) I agree the only component suffering at all here is the button, and it is built to take it. If the fan failed quickly then either the problem is not the fan or you got a bad fan. For the record I have worked on several fans and regulators but never that specific car.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra