If your coolant level drops while you’re driving but comes right back when you shut the truck off, you’re NOT losing coolant.You’re being pressurized out of it.This is a critical warning sign we see on heavy-duty diesel engines—especially Detroit DD15s—and if you keep driving it, it can quickly turn into a five-figure engine repair.In this video, I explain:• Why coolant drops only while driving• What pressurization really means• How ignoring it leads to major engine damageIf you’re seeing this s
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If your coolant level drops while you’re driving but comes right bac…
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🛢️💧 Coolant Found in Fuel Water Separator – DD15 Engine Diagnostic 💧🛢️During inspection, our specialist tech discovered coolant contamination inside the fuel water separator of this DD15 engine — a sign of a deeper issue that requires immediate attention.Coolant and diesel fuel should never mix. When coolant enters the fuel system, it can severely affect fuel lubrication and cause internal corrosion or injector damage if not repaired promptly.💡 Possible causes of coolant in the fuel system:
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🛢️💧 Coolant Found in Fuel Water Separator – DD15 Engine Diagnos…
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💧🔥 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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💧⚠️ 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 into
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💧⚠️ Coolant Reservoir Draining During Acceleration – DD15 Engin…
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TAT Express Inc. on Instagram: "🛠️💧 Air Compressor Bypassed – Confirmed Failure on This DD15 Engine 💧🛠️During the diagnostic process on this DD15 engine, our specialist tech performed a series of tests to identify the cause of coolant pushing out of the reservoir during acceleration. Initial symptoms included: • Coolant level dropping rapidly under load • Coolant overflowing with pressure • Signs that could indicate combustion gases entering the cooling systemTo narrow down the root cause, t
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