THERMO Bypass Valve-Operation
WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
The air-to-oil transmission cooler system has thermal bypass valve assembly that controls fluid flow through the cooler. When the transmission fluid is cold (less then operating temperature), the fluid is routed through the cooler bypass valve without flowing through the transmission cooler. When the transmission fluid reaches operating temperatures 71°C (160°F) and above, the thermostat closing off the bypass and allowing fluid to flow through the transmission cooler. The thermal bypass valve is serviced as an assembly.