MCHAM Posted August 8, 2011 Share Posted August 8, 2011 (edited) Is there a coolant additive out there to help diesels runn a little cooler. My RD runs around 190 all day on flat land & when I'm pulling up some hills she shoots up to 230. The temp drops back down to 190 once I get out of the hills Edited August 8, 2011 by MCHAM Quote Link to comment https://www.bigmacktrucks.com/topic/20101-coolant-additive/ Share on other sites More sharing options...
rhasler Posted August 8, 2011 Share Posted August 8, 2011 If your coolant temperature is getting that high you need to get the cooling system flushed out ASAP. The VMAC system should shut down the engine at 227 degrees (assuming you have a VMAC engine), if it isn't shutting down you're running the risk of major engine damage. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/20101-coolant-additive/#findComment-83381 Share on other sites More sharing options...
MCHAM Posted August 8, 2011 Author Share Posted August 8, 2011 I have a EM7 300 in my 1992 RD690S. I had the coolant system flushed when I got the truck. I just get that high temp when I'm coming out the hills with a load on my back. Quote Link to comment https://www.bigmacktrucks.com/topic/20101-coolant-additive/#findComment-83383 Share on other sites More sharing options...
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