Don't let it go my let go at 40 mph had to replace dist. cap,fan shroud,belt and nice dent in radiator so i am watching that real close now
for a possible leak. If you have noise and some end play it is not a question of if it will go but when! Best to change it because you need to than you have to on the side of the road

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Keeping 'em Running
1990 300SEL
1994 E320
1989 E300