This is a problem that seems to be magnified by the use of the AC. although, all systems seem to work correctly, the car cannot keep the temp in the optimal zone once the AC is on (with the fans blowing) ......without AC, temp is within 85-95 most of the time......

Is it ok to run the car for a while with the pressure cap half open so as to burb the system? I will take out the thermostat unit today and inspect....it is a 4 month old Behr unit, so I think it should be solid....

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1993 300E, 2.8 M104 .....