The invention relates to a liquid cooling system comprising a cooling unit and a liquid loop in which the liquid is arranged to be conveyed from a supply outlet of the cooling unit to a radio unit where the liquid is arranged to cool the radio unit before being conveyed back in the liquid loop to a return inlet of the cooling unit, the cooling unit being arranged located at a distance from the radio unit, wherein the cooling unit is an expandable cooling unit comprising a secondary outlet and a secondary inlet where, when an additional cooling unit of the liquid cooling system is connected with an inlet to said secondary outlet and with an outlet to said secondary inlet, the liquid is arranged to be fed from the cooling unit through the secondary outlet to the additional cooling unit arranged to also cool the liquid.