2-21. OPERATION IN EXTREME HEAT (CONT).
e. Perform operator PMCS more often than normal (Table 2-2).
f. When adding coolant to radiator, ensure water source is soft. Local desert water sources can have high mineral
deposits that will clog radiator.
g. Ensure that water/antifreeze mix is at least 50:50. This mixture raises the coolant boiling point to help prevent
2-22. OPERATION IN EXTREME DUST.
The vehicle normally operates in dusty conditions and PMCS instructions are designed to handle these conditions.
However, in deserts, dust conditions are more extreme and certain checks and services must be made more often than
a . Check air restriction indicator more often than normal to ensure air cleaner is not becoming clogged.
b. Check fuel/water separator frequently and drain it as necessary.
c. Watch all gauges in instrument panel more closely to ensure vehicle is not affected by dusty conditions.
d . Park vehicle so it does not face into wind.
Blowing dust and sand can scratch glass surfaces. When the vehicle is not being operated, glass surfaces
must be covered for protection.
e. Cover instrument panel, vacuum gauge, air restriction indicator, hydraulic fluid oil level indicator, fuel tank fill
cap, and spotlights when vehicle is parked for extended periods of time in extremely dusty conditions.
Cover open space in fuel tank fill hole when adding fuel to tank.
g. Do not fill fuel tank completely. Extreme heat will cause fuel to expand in tank and overflow.
h. High temperatures can damage hoses. Check radiator and lubricant hoses for leaks around fittings and replace
damaged hoses as necessary.