A radiator surge tank is used on all P12 Motorhome Chassis. The plastic surge tank is mounted on the top of the radiator support. There are two main differences between a coolant recovery reservoir and a radiator surge tank:

1. A radiator surge tank is designed to hold up to 110 kPa (16 psi) of pressure. The coolant recovery reservoir is only capable of withstanding 14 kPa (2 psi).
2. A radiator surge tank is designed for constant coolant flow between the tank and the radiator. The coolant recovery reservoir is designed to handle overflow from the radiator only.