The present invention relates to a thermostat device for a cooling system in a vehicle. The thermostat device (8) comprises at least one movably arranged valve body (16, 20, 34, 44) configured to distribute the coolant from an inlet (7') to two outlets (9', 10') in dependence on its position. The thermostat device (8) comprises a first thermal expansion element (31) configured to be in thermal contact with coolant entering the thermostat device via a pilot circuit (14) and to provide a first stroke of the valve body (16, 20, 34, 44) in response to the temperature of the coolant in the pilot circuit (14), and a second thermal expansion element (32) configured to be in thermal contact with the coolant received via the inlet (7') and to provide a second stroke of the valve body (16, 20, 34, 44) in response to the temperature of the coolant from the inlet (7') such that the valve body (16, 20, 34, 44) is moved to a position defined by the strokes from the thermal expansion elements (31, 32).
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