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Discussion Starter · #1 ·
Just picked up my first ever diesel up in Salt Lake City, and drove it back here to Phoenix. The entire way home, even in the 30 degree ambient temps in Utah, I saw trans and coolant temps above 200, with the coolant staying constant between 204-208 and the trans around 208-10, but going as high as 217-218 when in highway sections that required the trans to shift. I’ve read the radiator fan doesn’t come on until 217 so I’m okay with the coolant temps, but that trans temp seems extremely high for being unloaded, on the highway, in the cold. I got it home, changed all fluids including dropping the trans pan and changing the filters, and pressure washed the trans cooler/AC condenser as I’d heard that helped some people. Quite a lot of dirt came out, but it didn’t help one bit. I drove the truck around in my neighborhood and saw trans temps as high as 226. My ford raptor with 37’s never even saw those temperatures while rock crawling in the summer heat. This is in 50-60 degree winter temperatures. Does anyone have any insight as to What is going on? Bad sensor? Or is the cooler just completely screwed up? It also seems like there are two coolers, one up front and one on the side of the block, do I replace both? I’m scared to even drive the truck around town until I get this fixed so any help is appreciated.