SHACMAN Coolant Expansion Box Assembly DZ97259533031 The DZ97259533031 coolant expansion box is the recovery tank on SHACMAN heavy trucks. Coolant that is pushed out of the radiator while the engine is hot is stored here and then drawn back in as the engine cools, which keeps the radiator full and the cooling system at the right pressure. This is the complete box assembly with the filler cap and ports, supplied as a direct replacement for the original tank. The reinforced
