OPERATION
NOTE: (Refer to 21 - TRANSMISSION/AUTOMATIC -
42RLE - SCHEMATICS AND DIAGRAMS) for a visual
aid in determining valve location, operation and
design.
THERMAL VALVE
The thermal valve (1) (Fig. 260) 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.
Fig. 259 Valve Body - Exploded
1 - VALVE BODY
2 - T/C REGULATOR VALVE
3 - L/R SWITCH VALVE
4 - CONVERTER CLUTCH CONTROL VALVE
5 - MANUAL VALVE
6 - CONVERTER CLUTCH SWITCH VALVE
7 - SOLENOID SWITCH VALVE
8 - REGULATOR VALVE
Fig. 260 Thermal Valve
1 - THERMAL VALVE
2 - U1 ORIFICE
3 - NUMBER 2 CHECK BALL
21 - 150
AUTOMATIC TRANSMISSION - 42RLE
TJ
VALVE BODY (Continued)