QuirkyPixel Posted September 15 Share Posted September 15 Greetings. I possess a 2015 ST diesel engine with 185 horsepower. Encountered a problem with coolant loss; replaced the radiator, EGR cooler, thermostat, and installed a complete timing belt kit, utilizing entirely new components. When driven normally, it operates well; however, under aggressive driving, it overheats and continues to lose coolant, despite a pressure test indicating the head gasket is intact. Has anyone encountered this? I appreciate it. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted September 15 Author Share Posted September 15 https://www.amazon.com/s?ascsubtag=v1-be0c33-416258-c6ff39a422-k&k=EGR+cooler Quote Link to comment Share on other sites More sharing options...
mrnobady Posted September 15 Share Posted September 15 That appears to be a vexing problem, particularly following the replacement of the radiator and EGR cooler. You indicated that it only overheats and depletes coolant under strenuous driving conditions—have you observed any potential sources of coolant leakage? Elaborating on your observations may assist the individuals here in identifying the root cause. Quote Link to comment Share on other sites More sharing options...
paulh2602601 Posted September 15 Share Posted September 15 If it is not an external leakage, then it must be occurring internally. Did you conduct a pressure test while the engine was hot and operational? Did you intend to refer to a cylinder pressure assessment? Is the oil level rising? Conduct a pressure examination of the cooling system, particularly the cap. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted September 15 Author Share Posted September 15 I have no clue regarding the whereabouts of the coolant! We discovered that the pipe connecting the thermostat to the expansion bottle was defective!! I substituted it; I will ascertain today (Sunday) whether the pipe is the culprit!! I appreciate it. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted September 15 Author Share Posted September 15 Affirmative. Conducted a coolant pressure assessment with the engine at elevated temperatures, maintaining a pressure of 10 psi. We are conducting an additional pressure test to verify that nothing was overlooked. Quote Link to comment Share on other sites More sharing options...
stevenkeyte Posted September 15 Share Posted September 15 If the system maintains pressure throughout, the sole component you have yet to examine is the cap. When subjected to intense operation, it may become excessively hot, potentially causing the cap to fail under elevated pressure. In any case, acquire a new cap. They are exceedingly inexpensive. However, I would refrain from purchasing a Febi product as the recent one I acquired from them was unsatisfactory. Preferably acquire an original equipment manufacturer Ford component. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted September 15 Author Share Posted September 15 I installed a new expansion tank and a new cap from Ford last Friday. What is occurring is utterly foolish. Rearranging a pressure assessment once more. I appreciate it. Quote Link to comment Share on other sites More sharing options...
stevenkeyte Posted September 15 Share Posted September 15 That is peculiar. Was the heater set to hot during the test? Perhaps 10 psi may not be sufficiently elevated under extreme heat; could it sustain a greater pressure? Assume it does not overheat whatsoever. Merely attempting to consider alternative perspectives on the matter. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted September 15 Author Share Posted September 15 I have scheduled an appointment with Ford on Thursday for a second opinion; I will inform you of the outcome. I appreciate it. Quote Link to comment Share on other sites More sharing options...
MDMH757 Posted September 15 Share Posted September 15 I experienced a coolant problem once with my previous Smax. Following extensive contemplation and the utterance of numerous expletives, it was ultimately revealed that the issue stemmed from the coolant cap on the expansion reservoir. A simple solution, yet frustrating due to my oversight. Quote Link to comment Share on other sites More sharing options...
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