SHACMAN Expansion Tank Assembly DZ97259533031 The DZ97259533031 is the complete coolant expansion tank assembly for SHACMAN heavy trucks. It holds the coolant that is pushed out of the radiator as the engine warms up, then lets it flow back once the system cools, so the cooling circuit keeps a steady pressure instead of building up at the cap. The unit arrives as a full assembly with the filler cap and the hose ports already fitted, so it goes straight onto the original
