greendog32 Posted May 23, 2021 Share Posted May 23, 2021 2019 mp8 under load oil runs at 235-240,water runs around 215-220 and allison at 220-225.also pushes coolant out when this happens.fills half a gatorade bottle a day.dealer says this is normal and everything within spec😒.had to 2 dealer and neither is willing to fix it.ready to sell truck and change brands.sent leter to mack corprate and no response.very first dealer replaced expansion tank and radiator,all on my money.so 5 grand later still same issue Quote Link to comment Share on other sites More sharing options...
ksrolloff Posted May 23, 2021 Share Posted May 23, 2021 get used to it mack/volvo could care less about doing anything. you will never get a response from corperate Quote Link to comment Share on other sites More sharing options...
880joe Posted May 23, 2021 Share Posted May 23, 2021 Have you tried just leaving it a little low and see if it quits pushing coolant out? Also what dealers are you dealing with so the rest of us know to stay away from 1 Quote Link to comment Share on other sites More sharing options...
terry Posted May 23, 2021 Share Posted May 23, 2021 What Joe says about leaving the level low, don't know if it has a plastic expansion tank that you can see how much is in it, on a cold engine leave it low as you can in the expansion tank and see what happens.  terry 1 Quote Link to comment Share on other sites More sharing options...
wiserfrombud Posted June 14, 2021 Share Posted June 14, 2021 235-240 is where the engine oil should be as per the oil thermostat. 215-220 is past fan on temps.  Is the fan coming on?  This thing runs 220 on the water temp running down flat roads?  I have a feeling the pressurizing coolant and high temps are not related though high coolant temp will magnify a pressurizing problem.  Quote Link to comment Share on other sites More sharing options...
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