If the upper radiator hose isn't too hot to touch, chances are the thermostat is opening too early. Otherwise, the thermostat housing and hose should be at 80 C or more, much to hot to touch.

To bleed, try squeezing the upper radiator hose flat, then crimp the hose to the expansion tank shut, the relase the upper radiator hose. This will pull the air out of the radiator, where most if it sits (no way to vent except to the tank). Repeat and fill tank until it won't take any more, then expect to have to refill it a couple times. If you have the engine running with the ACC set to full heat (defrost with the temp wheel at the red clickstop), you will get most of the air right away.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!