Air Compressor Failures That Quietly Destroy DD15, X15, D13 & MX 13 Engines Coolant keeps getting pushed out while you’re driving… but comes back when you shut the truck off? That is NOT normal coolant loss. On modern semi-trucks — Detroit DD15, Cummins X15, Volvo D13, and PACCAR MX-13 — the air compressor is liquid-cooled. When the compressor head or casting fails, compressed air gets forced into the cooling system and pressurizes it. From the outside, it looks exactly like a blown head gasket.
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🛠️💧 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, the air compressor was bypassed —
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