💧🔥 EGR Cooler Leak Found – DD15 Engine Overheating & Coolant Loss 🔥💧This DD15 engine came in after the customer reported that the truck was running hot and losing coolant, even after several parts had already been replaced at another shop.During a detailed inspection of the cooling system, our specialist tech found coolant leaking directly from the EGR cooler — the root cause behind the overheating and coolant loss issues.💡 Why EGR cooler leaks happen:• Thermal stress and constant exhaust h
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💧🔥 EGR Cooler Leak Found – DD15 Engine Overheating & Coolant Lo…
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So how does the EGR system actually work on a DD15? The DD15 uses a three-piece exhaust manifold, and the EGR passage is built directly into the center section of that manifold.When the EGR valve opens, a portion of exhaust gas is diverted through a hot pipe and into the EGR cooler. Inside the cooler, exhaust gas flows through internal tubes surrounded by engine coolant. The gas enters extremely hot and exits at a lower temperature before being routed back into the intake.It’s still hot — just c
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So how does the EGR system actually work on a DD15? The DD1…
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💧⚠️ Coolant Reservoir Draining During Acceleration – DD15 Engine Diagnosis ⚠️💧 During inspection and live testing on this DD15 engine, our specialist tech observed that the coolant reservoir was draining rapidly every time the truck accelerated. This behavior is not normal and is a strong indicator that the cooling system is experiencing internal pressure issues. 💡 What this symptom suggests: When coolant drops under load or acceleration, it usually means the cooling system is being forced in
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💧⚠️ Coolant Reservoir Draining During Acceleration – DD15 Engin…
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How Sensors Control the EGR System on a DD15 🔧💨⚙️ On the intake side of the DD15, exhaust gas recirculation completes its path back into the engine. The EGR cooler feeds exhaust through a tube into the intake, and a delta-P (differential pressure) sensor monitors pressure on both sides of the system. That sensor — along with others like the intake temperature sensor — helps the ECM control the EGR valve. If the delta-P passages clog, EGR flow becomes inaccurate and drivability problems begin.
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How Sensors Control the EGR System on a DD15 🔧💨⚙️ On the inta…
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