Engine warms up quickly and runs hot - @235 degrees, computer sets code, dramatically affects performance.
Plenty of coolant, radiator clean, fan installed correctly, plenty of air circulating thru radiator, fan clutch operating normally, water pump
seems normal (no noise, no leaks, good crossflow in radiator).
Replaced thermostat – NO CHANGE – everything remained the same, engine runs @ 235 degrees, code, performance issues.
Removed thermostat – Engine warms up slowly and operating temp varies. Runs cool, @160-180 most of the time, creeps up to @200 on hottest days, engine performance good!
Installed new 195 degree NAPA premium grade thermostat. Engine runs hot again @225-235, computer sets code, performance issues. When at 235, turn heat on full blast, engine cools @10-15 degrees.