check if fluid is pink.If trans is not sliping either get new radiator or use a external trans cooler.I found it was cheaper to go with trans cooler,its better anyways.The two ends for transmission on the radiator just block off.Change your fluid,and disconnet side going to cooler to pump all pink fluid out.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt