Fluid temperature adjustment device

A fluid temperature adjustment device that includes a radiator that cools cooling water for an engine and a heat exchanger that exchanges heat between the cooling water and a working fluid for a transmission, the fluid temperature adjustment e device comprising:

• a circulation flow path that circulates the cooling water in one direction between the engine and the radiator;
• a first flow path branched from the circulation flow path at a location downstream of the engine and upstream of the radiator;
• a second flow path branched from the circulation flow path at a location downstream of the radiator and upstream of the engine;
• a third flow path that communicates with a cooling water outlet of the heat exchanger and that is merged with the circulation flow path at a location downstream of the radiator and upstream of the engine;
• and
• a switching valve that selectively communicates between one of the first and second flow paths and a cooling water inlet of the heat exchanger.