Method of operating a cooling system, computer program, computer-readable medium, control arrangement, cooling system, and vehicle

A control arrangement for controlling operation of a cooling system of a vehicle, the cooling system comprising a first and a second coolant circuit each configured to control the temperature of a number of components of the vehicle, wherein the cooling system comprises a filling point for filling the first coolant circuit with coolant,

• and wherein the first coolant circuit comprises:
• a first coolant pump configured to pump coolant through the first coolant circuit,
• a conduit section connected to a pump inlet of the first coolant pump,
• a primer conduit connected to the conduit section and to the second coolant circuit, and
• a conduit portion located between the filling point and the pump inlet of the first coolant pump,
• wherein the conduit portion is arranged below the pump inlet of the first coolant pump as seen relative to a local gravity vector, and
• wherein the control arrangement is configured to:
• initiate a supply of coolant from the second coolant circuit to the conduit section via the primer conduit during standstill of the first coolant pump, and then
• initiate operation of the first coolant pump.