TM  10-3930-638-24&P 2-17.   COOLING   SYSTEM   MAINTENANCE   (cont) d. Thermostat and Housing (cont). STEP LOCATION ITEM ACTION REMARKS REMOVAL 1 Engine  com- a. Two cap screws Remove partment (1) and lock washers  (2) b. Housing (3) Remove c. Gasket (4) Remove  and discard d. Thermostat Lift out (5) and  remove CLEANING WARNING Dry cleaning solvent (P-D-680), used to clean parts is toxic and flammable. Wear protective goggles and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use near open flame or exces- sive heat and don’t smoke when using it. Failure to do so could cause serious injury. If you become dizzy while using cleaning solvent, get fresh air immediately, and get medical attention. If contact with skin or clothes is made, flush with large amounts of water. If contact with eyes is made, wash eyes with water immed- iately, and obtain medical aid immediately. WARNING All parts Thermostat (5) Inspect Test Wear safety glasses when drying parts with compressed air. Failure to do so could cause serious injury to eyes and possible blindness. If you hurt your eyes or if a foreign object is blown into your eyes, seek  medical  attention  immediately. 2 All parts Clean Use  cleaning  solvent  P-D-680.  Dry  thor- oughly with compressed air. Remove all gasket material from housing and water  pump  mating  surfaces INSPECTION 3 Replace  if  cracked,  damaged,  or  damaged threads TESTING 4 Submerge in hot (175°) water with ther- mometer.  Heat  water.  Thermostat shall just start to open between 175- 182 degrees F and be completely open at 202 degrees F. Remove and dry with compressed air. Replace thermostat if it does not meet specification 2-87