It is screwed to the inside of the under dash fuse panel.
Yes.
No.
1999 300m
5w30
It is under the center of the dash, on the hump.
no
5x114.3
It has a belt.
10W3010W30
You can find a wiring diagram for a 1999 Chrysler 300m in the vehicle's owner's manual. You can also find it at various auto parts stores.
A 2000 Chrysler 300m does not have a heater valve. The cabin temperature is controlled by airflow doors.
It doesn't have one.