TM 9-2320-386-10 2-86 2-34. OPERATION IN EXTREME HEAT (Contd) (e) Place a thick cloth over surge tank filler cap (1). Carefully turn cap (1) counterclockwise to first stop to allow pressure to escape. (f) Remove cap (1) when cooling system pressure is vented and check coolant level. Surge tank (2) should be filled approximately to bottom of filler neck. CAUTION Ensure engine is running before adding coolant to hot engine. Failure to do this may result in damage to engine. (g) Add engine coolant as required (para. 3-7). Install surge tank filler cap (1) after filling, and start engine (para. 2-12). (h) Proceed with operation. Report any overheating to unit maintenance upon completion of operation. d. Stopping or Parking (1) Park vehicle in a sheltered area out of sun if possible. (2) If shelter is not available, cover vehicle with paulin. When entire vehicle cannot be covered, protect windows, cab, and engine compartment with paulin to prevent entry of sand or dust. (3) Check batteries daily and service as required when operating in extreme heat. e. After Operation. .WARNING. Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with effective chip guarding and personal pro- tective equipment (goggles/shield, gloves, etc.). 1 2