TM  10-3930-638-24&P 2-31. SENDING UNITS AND SWITCHES MAINTENANCE (cont) c. Engine and Transmission Temperature Switches (cont). (1) Engine Temperature Switch. STEP LOCATION ITEM ACTION REMARKS REMOVAL 1 Engine  compart- a. Nut (1), lock washer (2) Remove From switch terminal ment front, left and wire lead (3) side  of  vehicle b. Temperature switch (4) Remove Turn counterclockwise and pull from engine c. Retainer halves (5) Push  together, Remove  resistor  (6) turn and separate 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 excessive 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  immediately,  and  obtain  medical  aid  immediately. WARNING 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 Nut (1) and lock washer (2) Clean Use cleaning solvent P-D-680. Dry thoroughly with compressed air 3 Wire connector and Clean Use cleaning solvent P-D-680 on switch  terminal connector and terminal only INSPECTION 4 Replace if worn, or if threads damaged 5 Replace if insulation frayed, or if conductor  broken Nut (1) and lock Inspect washer (2) Harness  wire Inspect 2-163