Took about 20 minutes. Findings:
one of the spade lugs (blue wire) to the motor was really loose, amazed the lug had not fallen out. motor and fan not to dirty. Put it all back together and tested. I wound up with about 3 speeds, but no high. But it is adequate for cooling down the car in reasonable time.

Did not find the usual MB parts numbers on either the switch or motor. The fan was Behr?. The switch seemed intact and the solder points (2) looked a little scorched but not oxidized. A little graphite like powder fell from the motor assembly but otherwise looked remarkably clean for a car fan.

Put it all back together and no vigorous blow but adequate. Any suggestions?????? Also do you keep the squirrel cage fan and just replace the motor, or does it all come together?

Regards, Harvey

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hlg