Component carrier for a dosing system

A component carrier (20) of a dosing system for injecting a urea solution into the exhaust gas flow (9) of an internal combustion engine having a coolant circuit for selective catalytic reduction, the dosing system being connected to a urea tank (1) from which urea solution can be taken, and the dosing system being connected to a compressed air supply (6), the dosing system having a pump (3) for delivering the urea solution and the dosing system having at least one nozzle (5) through which the urea solution is injected into the exhaust gas flow (9) by means of compressed air, characterized in that the components comprising a urea solution line (2), the pump (3), the compressed air line (6), valves (7, 14), and ports (51, 52) of the dosing system are mounted on the component carrier (20) and in thermal contact with the component carrier (20) and wherein the component carrier (20) has at least one contact region defined by at least one pair of grooves (21, 22) for providing thermal contact with a fluid with a higher temperature, in connection with the coolant circuit and wherein the component carrier (20) forms a heat sink so that the components comprising a urea solution line (2), the pump (3), the compressed air line (6), valves (7, 14), and ports (51, 52) are mounted in thermal contact with the component carrier (20) and are heated.