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Volvo 240 - transmission oil in radiator. 200 1989

The od problem you mention is probably caused by water in the fluid. The od hydraulic circuit just barely works with pure low viscosity fluid; the water adds viscosity, hence the normal operation with hot fluid. The cooler has a pinhole in it, which is not unheard of with a "new" radiator. Transmission oil would bleed into the radiator during operation and the opposite would happen after shutdown. After changing the radiator, change and flush the transmission fluid at least twice over a 2-week period and you may be able to save the transmission-they don't like water.






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