Hi guys, well I think I'm able to narrow my problem down to whether it is a Blower Motor or a Blower Motor Regulator. The problem is that my
97 S-320 does not want to either blow airconditioning, heating or even function in the defogger mode.

I did the research on this site and read its either the blower motor or regulator, but how do I determine whether it is the blower motor or regulator ?

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1997 S-320 (188,000)
1993 300SD (167,000)
1979 300SD (Odometer Stopped at about 220K)
1998 E-300 Tubro Diesel**(Owned)
1987 300E**(Owned)