🚨 Coolant “Disappearing” While Driving? This Is Why 🚛💥 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

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