Semi Truck Expansion Tanks We have a selective choice of Reservoirs also known as Coolant Tanks here at Modern Semi truck Parts, located in Ontario Ca. The coolant reservoir is the plastic reservoir mounted in the engine bay that stores the coolant for the engine. VOLVOFREIGHTLINER CASCADIAFREIGHTLINER M2KENWORTHINTERNATIONALVOLVO Volvo Reservoir – Coolant Tank $150.00Â + Tax Volvo VNL – Air Filter $70.00Â + Tax Volvo VNL – NEWER Air Filter $80.00Â + Tax FREIGHTLINER CASCADIA 2018+ Freightliner Cascadia Reservoir – Coolant Tank $190.00Â + Tax Older Freightliner Cascadia Reservoir – Coolant Tank $180.00Â + Tax 2018+ Freightliner Cascadia Air Filter $75.00Â + Tax ’08-2017 Freightliner Cascadia Air Filter $65.00Â + Tax FREIGHTLINER M2 Freightliner M2 Reservoir – Coolant Tank $110.00Â + Tax KENWORTH Kenworth Reservoir T680 – Coolant Tank $190.00Â + Tax Kenworth T660/T800 Reservoir – Coolant Tank $160.00Â + Tax Kenworth T660/T800 Air Filter $75.00Â + Tax INTERNATIONAL International Prostar Reservoir – Coolant Tank $160.00Â + Tax