Intercooler for an engine

An intercooler for an engine comprises a first tank part (112) with an inlet area (130) and an outlet area (134); a second tank part (14); and a heat exchanger part (16) comprising a number of ducts that communicate at one end with said first tank part (112) and at the other end with said second tank part (14), said inlet and outlet areas (130, 134) each being associated with a respective number of ducts (221, 224) of said heat exchanger part (16). The intercooler further comprises bypass and flow control means in said first tank part (112) operable to direct a flow of air from said inlet area (130) to said outlet area (134) without flowing through said heat exchanger part (16) and for controlling the flow rate through said heat exchanger part (16).