If you do a coolant flush, open the block drain and get as much crud out as you can. There are some good posts on here about the different flushes to use. You could try pulling the thermostat and see if the car runs cooler or not. Good Luck.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon