Forum Discussion
jaycocamprs
Jan 30, 2020Explorer
ShinerBock wrote:
From what I have read and what I have scene in past reviews, the L5P Duramax normally runs at 210F coolant temps even unloaded which is where it was at in the video the whole way up.
My 18 L5P has never run any where near that hot unless it was at or near full load. Yes the gauge shows 210F, shows 210 all the way from 170F till the fan came on at 218F. GM stiffed the gauge with the LLY's and it still the same. If you want a true read you need to read the ECM through the OBDII
Part stores still list 180f & 185f T-stats for a 2018 and that's what the ScanGauge shows unloaded
GM (at least thru 2018) uses a 4 stage fan clutch, it's not real obnoxious till stage 3
About Travel Trailer Group
44,052 PostsLatest Activity: Nov 23, 2025