C 3500 Truck 2WD V8-454 7.4L (1990)
Thermostat: Service and Repair
1.
Drain cooling system until radiator coolant level is below thermostat.
2.
Remove thermostat housing bolts and/or studs, then thermostat housing and thermostat.
3.
Thoroughly clean gasket surfaces of thermostat housing and intake manifold.
4.
Reverse procedure to install. Torque thermostat housing bolts and/or studs to 21 ft. lbs. on all except 7.5L/V8-454 engine, on 7.5L/V8-454
engines torque bolts to 27 ft. lbs.
