Typical engine thermostat temp is fully open at 95C, so 100 is about what I would expect with AC on at high outside temps.
120C would indicate either a cooling system problem (bad rad, bad cap, etc) or the visco clutch not working.
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!
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