Removal & Installation 1. Remove the air cleaner and duct assembly. See Fig. 10 . Drain the coolant until the coolant level is below the thermostat. See COOLING SYSTEM BLEEDING . 2. Remove the crossover exhaust pipe. See Fig. 11 . Remove the radiator hose from the thermostat housing. 3. Remove the thermostat housing bolts and clean any sealer from the bolt threads. See Fig. 12 . Remove the thermostat housing and gasket. 4. Remove the thermostat. Inspect and clean the mating surfaces. 5. Install the thermostat housing and gasket. Install RTV sealer (GM P/N 1052366) to the thermostat housing bolt threads. Install the thermostat housing bolts. See TORQUE SPECIFICATIONS . 6. To complete installation, reverse removal procedure. Fill the cooling system. Inspect the cooling system for leaks. Repair as necessary.