Why So Many “Fixed” DD15s Come Back Worse Cooling System Explained A lot of modern diesel trucks don’t fail all at once — they fail in stages. We see DD15, X15, Volvo D13, and PACCAR MX-13 engines come into the shop every week that were already “fixed”… but the cooling system is still pressurizing, hoses are still getting hard, and coolant keeps getting pushed out. That’s not bad luck. That’s a missed diagnosis. When a liquid-cooled air compressor fails or a cooling system gets pressurized, it d
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