Thermal Valve

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Thermal Valve, U1 Orifice & No. 2 Check Ball

Courtesy of DAIMLERCHRYSLER CORP.

1 - THERMAL VALVE

2 - U1 ORIFICE

3 - NUMBER 2 CHECK BALL

The thermal valve (1) is a bi-metallic shudder valve that helps control the venting rate of oil pressure in the underdrive clutch passage during release of the clutch. When the oil temperature is approximately 20 degrees Fahrenheit or less, the valve is fully open to assist in venting oil past the U1 orifice (2). At temperatures above 20 degrees, the valve starts to close and becomes fully closed at approximately 140 degrees. The thermal valve is located in the transfer plate of the valve body. See Fig 1.