Perhaps a bad thermostat, or air in the system? I thoroughly flushed the entire system, then flushed each part of the cooling system individually, engine block including removing driver side drain plug , heater core, and radiator, reservoir tank, etc. Let us know how it goes with the load on. Never got hotter than 210 and always ran at 210 regardless of load or grade. The easiest type of technical maintenance is changing engine oil, axles oil, manual and automatic transmission oil. Took it camping with the camper this past weekend up the local grade Sherwin Grade like i've done so many times in the past. I drove the truck back over the same grades without the camper and the engine temp never waivered off 200.
Does your trucks oil cooler lines run to a separate oil cooler radiator? Any ideas as to what is happening when loaded and going up the grades? You can share this information with your friends. Edited September 13, 2016 by cfsierra shop replaced the tstat under warranty and replaced the clutch fan as it was leaking. I want to make sure we have all the correctly specced parts, radiator size etc. Not sure if the fan clutch is engaging fully or not. It was late in the evening, kinda dark, and i noticed the passenger side exhaust manifold was glowing red! Note: all capacities are approximate. We have this information and we give it to you for free.
Also some different behavior than before work was done-going down the same grade the engine temp cooled down to ~185. Any suggestions or ideas would be appreciated. If you fill engine or axles of your car with oil to the brim it may damage your vehicle engine or axles and void manufacturer warranty. If the air conditioning system in your vehicle needs refrigerant, be sure the proper refrigerant is used. So i figured the fan clutch was defective since it seemed to have spotty engagement and replaced it with the standard oem gm fan clutch. I'm going to call the guys today who worked on it and see what they think.
If you're not sure, ask your dealer. The truck runs fine, no missing, check engine light is off, so i don't think i've got any gasket leaks, yet at least! Note: not all air conditioning refrigerants are the same. I'm mot sure what's going on. I can spin the blades a quarter turn after its up to temp. Does your trucks oil cooler lines run to a separate oil cooler radiator? I was even running the heater a full hot; but that didn't drop the engine temp. I had never replaced the coolant since i bought it new in '00. .
Thermostat seems to be opening at the proper temp when warming up 187. The shop was instructed to use replacement parts that meet the oem standards; ie no rebuilds. One thing i did notice last week with the camper off i stopped at the top of the canyon, after running the truck hard, i popped the hood to listen to the fan. Well that resulted in the engine temps climbing to 235 along with the trans going in the same direction all climbing until i aborted and headed home. .
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