A locking device arranged for mounting on a radiator bracket (20, 120), and the locking device further being arranged for preventing against unintentional dismounting of a radiator or a stirrup member mounted on the radiator from the radiator bracket (20, 120), the locking device comprising: a first end, wherein the first end is a lower end, referring to a using position of the locking device, a second end, distal from the first end, wherein the second end is an upper end, a first side facing the bracket (20, 120) in a mounted position on the bracket (20, 120), a second side facing away from the bracket (20, 120) in the mounted position on the bracket (20, 120), a pin, arranged near the first end on the first side of the locking device for pivotal attachment to the bracket (20, 120), the pin is arranged to fit into a first recess of the radiator bracket (20, 120), wherein the locking device is pivotable around a pin axis (X-X) of the pin between at least one first locking position and an unlocked position of the radiator or stirrup member relative the bracket (20, 120), a spring means, arranged for counteracting a movement of the locking device between the locking position and the unlocked position, a first locking lug arranged between the first end and the second end, the first locking lug being arranged for locking a part of the radiator or the stirrup member mounted on the radiator to the bracket (20, 120) in the first locking position, a holder arm arranged on the first side of the locking device between the first locking lug and the first end, the holder arm forming a first gap between the holder arm and the first side, characterized by that the first gap is arranged to receive an upper edge of the bracket (20, 120), wherein a distance between the pin axis (X-X) and a stop surface (9a, 9b) of the first gap is adopted to allow the movement of the locking device between the first locking position and the unlocked position, a pin protrusion arranged transversely relative the pin, at a distal end of the pin such as forming a second gap between the first side of the locking device and the pin protrusion, wherein the pin protrusion is arranged to retain the pin in the first recess of the bracket (20, 120), wherein the first gap and the second gap is arranged to accommodate the bracket (20, 120) in a mounted position of the locking device on the bracket (20, 120). a first end, wherein the first end is a lower end, referring to a using position of the locking device, a second end, distal from the first end, wherein the second end is an upper end, a first side facing the bracket (20, 120) in a mounted position on the bracket (20, 120), a second side facing away from the bracket (20, 120) in the mounted position on the bracket (20, 120), a pin, arranged near the first end on the first side of the locking device for pivotal attachment to the bracket (20, 120), the pin is arranged to fit into a first recess of the radiator bracket (20, 120), wherein the locking device is pivotable around a pin axis (X-X) of the pin between at least one first locking position and an unlocked position of the radiator or stirrup member relative the bracket (20, 120), a spring means, arranged for counteracting a movement of the locking device between the locking position and the unlocked position, a first locking lug arranged between the first end and the second end, the first locking lug being arranged for locking a part of the radiator or the stirrup member mounted on the radiator to the bracket (20, 120) in the first locking position, a holder arm arranged on the first side of the locking device between the first locking lug and the first end, the holder arm forming a first gap between the holder arm and the first side, characterized by that the first gap is arranged to receive an upper edge of the bracket (20, 120), wherein a distance between the pin axis (X-X) and a stop surface (9a, 9b) of the first gap is adopted to allow the movement of the locking device between the first locking position and the unlocked position, a pin protrusion arranged transversely relative the pin, at a distal end of the pin such as forming a second gap between the first side of the locking device and the pin protrusion, wherein the pin protrusion is arranged to retain the pin in the first recess of the bracket (20, 120), wherein the first gap and the second gap is arranged to accommodate the bracket (20, 120) in a mounted position of the locking device on the bracket (20, 120).