1311910-133 is an expansion tank assembly (usually with a filler cap) for commercial vehicle (truck) cooling systems.

Product Attributes:

Name: Expansion Tank Assembly / Auxiliary Water Tank / Compensation Water Tank / Coolant Reservoir.

Location: Typically installed in a specific location at the rear of the cab or engine compartment, referred to as a "rear-mounted" or "small water reservoir behind the cab".

Main Functions:

Pressure Regulation: Absorbs the increased volume of coolant when heated, preventing overpressure in the cooling system.

Level Compensation: Acts as a coolant reservoir, replenishing fluid when the system cools and contracts.

Air-Water Separation: Expels air from the cooling system, improving heat dissipation efficiency.