When I just bled my system (M42), I filled the expansion tank up until it started coming out of the bleed screw, then with the heater on full heat and the blower on low I turned on the car and let it idle until the bubbles stoped coming out of the bleed screw(the engine reached normal operating temp). It wasnt until the very end that the Tstat opened up and the passenger side upper radiator hose got hot.
HTH
Aaron
HTH
Aaron
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