This o-ring, part number N 90316802, seals the temperature sender (for the gauge) and temperature sensor (for the fuel injection system) located in the thermostat housing of every 86-92 Vanagon. The 2wd requires one of these for each, while the Syncro only needs it for the sensor, as the sender is a screw-in type. When replacing this, it would also be good to replace the clip as well. It fits 1986, 1987, 1988, 1989, 1990, 1991 and 1992 models.
1 needed for each application