Patent ID: 8851027

Claim:
A thermostat apparatus comprising: a thermostat case including a first passage and a second passage; a valve body disposed in the thermostat case, wherein a first valve is formed at a first end thereof to open or close the first passage; a retainer, one end portion of which is mounted on a second end of the valve body, wherein a second valve is formed at the other end portion of the retainer to open or close the second passage; an elastic member that elastically biases the retainer in a direction to make the first valve close the first passage and make the second valve open the second passage, wherein the elastic member extends from the one end portion of the retainer to the second passage; and a drive portion that is configured to push the retainer in a direction that according to temperature, the first valve opens the first passage and the second valve closes the second passage, wherein the drive portion is disposed in the valve body.