Thermostat and Water Control Valve

Install the thermostat and water control valve with the whole circumference of each flange fitting securely inside the rubber ring.
(The example in Fig 1 is the thermostat.)

Fig 1: Installing Thermostat Inside Rubber Ring
Courtesy of NISSAN MOTOR CO., U.S.A.
Install the thermostat with the jiggle valve facing upwards. (The position deviation may be within the range of +/-10°.)
Install the water control valve with the up-mark facing up and the frame center part facing upwards. The position deviation may be within the range of +/-10° of vertical.

Fig 2: Installing Thermostat With Jiggle Valve In Correct Position
Courtesy of NISSAN MOTOR CO., U.S.A.