The howl is the fan running, and if you dont' get that noise, it's replacement time again.

The oil leaks out the actuating pin seal and the back seal. Silicone fluid "crawls" badly.

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!