Blower motor working then not working

[dubadaddy]

Got in my 1990 300CE yesterday and was driving around town with A/C on. Stopped and started several times with A/C on and then the last time went to turn on the A/C and no blower motor...does not seem to respond at any level with any of the fan speeds on low, high, or auto functions.

No A/C or E/C or function of any of the climate controls. Fuses are good, removed and reinstalled.

Could this be a blower regulator or blower itself...how would I test this scenario?