nylan Posted July 8, 2014 Share Posted July 8, 2014 I have a 2010 pinnacle with an mp8 engine and have had it into mack salt lake city three times now for overheating. Replaced fan clutch, thermostat, injector cups. still over heats on hills while running empty. Any help would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/ Share on other sites More sharing options...
MHfred Posted July 8, 2014 Share Posted July 8, 2014 I don't want to be the bearer of bad news but my Volkswagen diesel did the same thing years ago and it was a blown head gasket. Apparently combustion gases were getting into the coolant passages causing it to get air bound.???? Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252170 Share on other sites More sharing options...
felicello122 Posted July 8, 2014 Share Posted July 8, 2014 water pump or radiatot? my 2000 rd used to get hot untill i changed the radiator. the opening on the hood is small and air has a tough time getting in there especially if you got a grill guard like i do, we used to remove it in the summer. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252186 Share on other sites More sharing options...
Charlie123 Posted July 8, 2014 Share Posted July 8, 2014 What does your oil temp run Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252194 Share on other sites More sharing options...
gearhead204 Posted July 8, 2014 Share Posted July 8, 2014 running around salt lake and as much salt as you guys use and with charge air coolers being aluminum check to see if your getting air flow thru all components rad. charge air, and condenser. I'm betting your plugged! Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252200 Share on other sites More sharing options...
nylan Posted July 9, 2014 Author Share Posted July 9, 2014 thank you all for the info. I am having it flushed out today. When the water gets high so does the oil temp. I am betting something is clogged also. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252284 Share on other sites More sharing options...
MHfred Posted July 9, 2014 Share Posted July 9, 2014 Let us know what you find the problem to be.Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252288 Share on other sites More sharing options...
wheeler73 Posted July 10, 2014 Share Posted July 10, 2014 I have see the water pump impeller slip on the shaft only when the coolant is hot on the MP engines several times. I would have it checked. Sometimes you can make the impeller slip when it is warm and you hold the shaft. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252378 Share on other sites More sharing options...
Mackpro Posted July 10, 2014 Share Posted July 10, 2014 Did your truck have the Borg Warner Cool Logic fan clutch? We have had lots of problems out of them. We now order most all our stock trucks with Horton 2-speed fans on them. Have they reflashed the engine ECM?PV729-FSB263-039_M.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252436 Share on other sites More sharing options...
Mackpro Posted July 10, 2014 Share Posted July 10, 2014 I thought I had read that you replaced the water pump but now I see that you didnt. Replace it cause if its original I cant believe its lasted this long! LOL. They are made from the cheapest pot metal and plastic known to man. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-252437 Share on other sites More sharing options...
MHfred Posted July 23, 2014 Share Posted July 23, 2014 What was the problem? Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-253806 Share on other sites More sharing options...
nylan Posted July 26, 2014 Author Share Posted July 26, 2014 (edited) i've replaced fan clutch thermostat have new injector sleaves flushed the rad and put new coolant in ran down to california from slc empty still got hot and oil temps rise with the coolant oil runs at about 230 in normal conditions. So any way on the way back I only had about 15 thousand pounds on and that truck couldn't run cool to save its life tell I got to cedar city and the sun went down got cooler and the truck ran great. I'm thinking on a new radiator are there any companies that make an aftermarket high flow radiator. I am all out of ideas love to keep the truck I think it is a good one if I can run it. Thanks for all your help....Ny Oh I did have water pump checked out it is fine.. Edited July 26, 2014 by nylan Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-254043 Share on other sites More sharing options...
MHfred Posted July 26, 2014 Share Posted July 26, 2014 I posted earlier about my Volkswagen head gasket causing the same symptoms you have. I know there is 4 or 500 horse power difference but I still suspect the head gasket. If it was running cool before and you had the radiator flushed, I would not spend money on a new radiator. Good luck and thanks for keeping us updated. Quote Link to comment https://www.bigmacktrucks.com/topic/36288-overheating/#findComment-254065 Share on other sites More sharing options...
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