REMOVAL
GAS - PRIMARY THERMOSTAT
1. Partially drain cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE).
2. Remove air filter housing.
3. Disconnect coolant hose (1) from inlet housing (2).
4. Remove inlet housing bolts (3).
5. Remove thermostat assembly, and clean sealing surfaces.
GAS - SECONDARY THERMOSTAT
1. Partially drain cooling system. (Refer to 7 - COOLING - STANDARD PROCEDURE).
2. Remove air filter housing .
3. Disconnect coolant hoses (1) from rear of coolant adapter (2).
4. Remove radiator hose (3).
5. Remove radiator hose (4) from front of coolant adapter (2).
6. Remove coolant adapter mounting bolts.
7. Carefully slide coolant adapter off water pump inlet tube and remove coolant adapter (2) and secondary thermostat.
DIESEL ENGINE
WARNING: Do not loosen the radiator cap with the cooling system hot and pressurized. Serious burns from the coolant can occur.
1. Disconnect negative battery cable.
2. Remove engine cover (Refer to 9 - ENGINE - REMOVAL).
3. Drain engine coolant below thermostat level using draincock only (Refer to 7 - COOLING/ENGINE/COOLANT - STANDARD PROCEDURE).
4. Disconnect coolant temperature sensor electrical connector.
5. Remove coolant hoses and by-pass hose (1) from thermostat housing (2).
6. Loosen accessory drive belt and reposition generator (Refer to 8 - ELECTRICAL/CHARGING/GENERATOR - REMOVAL).
7. Remove thermostat housing (2) and o-ring .
8. Clean all sealing surfaces.