EGR Thermo Valve

Fig. 35 Testing The Thermo Valve (Federal Only):

1. Disconnect the vacuum hoses from the thermo valve and connect a hand vacuum pump to the nipple of the thermo valve.
2. Apply vacuum and verify that when the engine is cold (coolant temperature less than 50 degrees C or 122 degrees F) vacuum leaks.
3. Allow the engine to warm up (coolant temperature greater than 80 degrees C or 176 degrees F), apply vacuum and verify that vacuum is held.
4. If it is necessary to remove the thermo valve do not apply a wrench to the resin part of the valve. Re-install the thermo valve using 3M locking sealant 4171. Torque the thermo valve to 20-40 Nm or 15 to 30 ft lb.
5. Reconnect the vacuum hoses.