3-46. TM 9-2320-361-20 This task covers: a. Removal c. Installation b. Testing INITIAL SETUP: APPLICABLE MODELS All MATERIALS/PARTS Two lockwashers Gasket Seal REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-20P EQUIPMENT CONDITION Ž Parking brake set (TM 9-2320-361-10). ● Hood raised and secured (TM 9-2320-361-10). • Upper radiator hose removed (para. 3-43). GENERAL SAFETY INSTRUCTIONS Use caution when testing thermostat. Hot water may cause injury to personnel. NOTE Have drainage container ready to catch coolant. 1. Loosen two clamps (4) on hose (5). 2. Remove two screws (3), lockwashers (2), housing (l), and gasket (8) from intake manifold (7) and hose (5). Discard lockwashers (2) and gasket (8). NOTE Observe position of seal in housing. 3. Remove thermostat (10) and seal (9) from housing (l). Discard seal (9). 4. Remove hose (5) and two clamps (4) from water pump (6). Use caution when testing thermostat, hot water may cause injury to personnel. NOTE Do not let thermostat touch container sides. 1. Place thermostat (10) in container of water heated to 185°F (85°C). 2. Observe thermostat (10). If thermostat fails to open, replace thermostat (10). 1. Install hose (5) and two clamps (4) on water pump (6). Do not tighten clamps (4). NOTE New seal must be pressed into same position as old seal. 2. Install new seal (9) on housing (1) by tapping into place. 3. Install thermostat (10) on housing (l). 4. Install new gasket (8) and housing (1) on hose (5) and intake manifold (7) with two new lock- washers (2) and screws (3). 5. Tighten two clamps (4) on hose (5). 3-104