Engine Coolant Thermostat Housing Replacement (L83, L86)

Fig 1: Engine Coolant Thermostat Housing

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
CAUTION: Use caution when removing the hose from the thermostat housing. The plastic thermostat housing may break if excessive force is used. Preliminary Procedures Drain the cooling system. Refer to Cooling System Draining and Filling (Vac N Fill L83 L86) Cooling System Draining and Filling (Static Fill L83 L86) . Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Chevrolet and GMC)Air Cleaner Outlet Duct Replacement (Cadillac) . Disconnect the radiator inlet hose from the thermostat housing. Refer to Radiator Inlet Hose Replacement (L83 L86) . Disconnect the radiator surge tank inlet hose from the thermostat housing. Refer to Radiator Surge Tank Inlet Hose Replacement (Surge Tank To Radiator L83 L86) Radiator Surge Tank Inlet Hose Replacement (Surge Tank To Water Outlet L83 L86) .
1	Thermostat Housing Bolt (Qty: 3) CAUTION: Refer to Fastener Caution . Procedure Remove the thermostat housing bolts. Tighten 10 N.m (89 lb in)
2	Thermostat Housing
3	Thermostat Housing Gasket Procedure Install a new thermostat gasket.