Checking The Bypass Thermostat

WARNING: This page is about a different car, the 2009 Volkswagen Rabbit, 2008 Volkswagen Rabbit, 2007 Volkswagen Rabbit, and 2006 Volkswagen Rabbit. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Bypass Thermostat - Assembly Overview

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

1 -

Spring bracket

2 -

Lower part of housing

Note the installed position: The arrow points toward the automatic transmission fluid cooler

3 -

Operating element

4 -

Spring

5 -

O-ring

6 -

Upper part of housing

-- Remove the operating element -3- and heat in a hot water bath.

Starts to open: approximately 75 °C (167 °F)

Stops at: approximately 85 °C (185 °F)

Opening lift: approximately 5 mm