One more thing is needed. There is a cold engine lockout switch and relay at the other end of the diagram you provided. It puts 12 volts on pin c1-12 to allow the fan to come on. It is usually energized by the engine temp but also energized when in defrost mode. If this relay doesn't send 12 volts out c1-12, the blower will stay off.

Paul

__________________
84 500 SEL (307,xxx miles)