Quote:
Originally Posted by RL18
How many miles? Have you replaced the water pump? What's your coolant temperature when you're car warms up?
I can't imagine carbon build up would cause a coolant issue.
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I'm not having a coolant issue, just fault code P2457 (EGR) Cooling System Performance.
My thermostat was replaced at the same time as the EGR cooler because the temperatures weren't going up and I found the thermostat spring broken when I removed it. My EGR cooler was leaking coolant from the welds that appeared to crack so I replaced it at the same time. My coolant temperature is around 180-190F if I recall correctly checking with my Carly app.