See TM 9-2815-252-24 page 3-18
3-9. THERMOSTAT.
3-9.1. Removal.
a. Remove negative battery cable.
b. Drain coolant system, refer to end item maintenance manual.
c. Loosen hose clamp and disconnect outlet hose from thermostat housing (3, FIGURE 3-4).
d. Remove two capscrews (1), washers (2), thermostat housing (3), and gasket (4). Discard gasket (4).
e. Remove thermostat (5) from water pump.
NOTE
If thermostat is suspected of being defective, replace thermostat.
3-9.2. Inspection.
a. Inspect thermostat for excessive wear or damage.
b. Inspect housing for cracks, corrosion, or other damage.
3-9.3. Replacement,
a. Replace thermostat if worn or damaged.
b. Replace housing if badly corroded or damaged.
3-9.4. Installation.
a. Remove all covers installed during removal.
b. Clean any debris and traces of old gasket from thermostat housing (3, FIGURE 3-4) and water pump (11) mating
surfaces. Dry all surfaces.
c. Install thermostat (5) in water pump.
d. Install new gasket (4), thermostat housing (3), two washers (2) and capscrews (1).
e. Connect outlet hose to thermostat housing (3) and secure with hose clamp.
f. Service coolant system, refer to end item maintenance manual.