Going thru a high temperature problem hoping someone here can help. Truck is a deleted 2013 Cascadia DD15 with inframe done about 90k miles ago. I was loaded, my temp was rising, moving higher & higher. It stopped & hovered in the 225 degrees area. Water pump is OEM about 2yrs old. No leaks. Just had new OEM thermostat & coolant temperature sensor installed today thinking this was my problem. It seemed to work. Drove around to bring up temperature up but it stayed kinda low between 185 going down to 160ish. Which seemed odd but I figured it had to do with being a new thermo. Made sure coolant topped off. I drove about 45min to deliver my load. Seemed to run kinda high about 200/205. Normally would be about 195ish. I offloaded & I'm driving back empty & needle is rising to about 210 then hovers to 215 to 220 & goes up & stays hovering about 225 again. Don't know what gives. Defective OEM thermostat? Inside impeller of the water pump broke off maybe? Plugged up coolant filter? or something else. I removed my coolant filter and drove about 15min that way. no change. I'm wondering if the water pump impeller had broke off inside so not able to push coolant thru system could this spike in high temperature kill a thermostat? Maybe killing my old & new one causing them to stay closed? The top of my radiator & hose going to egr cooler/head is hot. Bottom of my radiator & hoses/pipes going to thermostat housing are cold. Thermostat feels hot. Belts are present & intact. Fan is on. No coolant being pushed out of reservoir. No bubbles in coolant or oil present in coolant. No coolant present in oil (thank God). No white smoke in exhaust. Very confused. Another problem is that thermostat was last one dealer had. Theres none for hundred's of miles around me. I'm in San Antonio. I'm thinking to take old thermostat & drilling out the plunger & letting it free flow for now. If that works and there's flow then culprit bad old thermostat & defective new thermostat. Or if no change it's a bad WP. What do u all think? Any help would be greatly appreciated.
Mysterious high temperature situation with DD15
Discussion in 'Freightliner Forum' started by importvic, Feb 4, 2023.