rondefly Posted July 20, 2009 Share Posted July 20, 2009 have been with this problem for a year. Replaced all filters, flushed out oil cooler off the engine, replaced sensors on coolant and oil, replaced radiator, water pump, thermostat, Fan comes on at 200 deg, but oil temp runs 250 to 270 on flat with 75000, van load. then goes up if I climb a grade, have to slow to 10 MPH to keep it under 270. if it goes over that the 1/4" air hose from compressor to governor blows from the turbo heat. Can I hook a override sw for the fanto be able to turn it on when I want. Mack rep says 250 to 270 is ok for short periods. helpRon Quote Link to comment Share on other sites More sharing options...
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