Safety Considerations—Notes, Cautions, and Warnings As you read through the procedures, you will come across NOTES, CAUTIONS, and WARNINGS. Each one is there for a specific purpose. NOTES give you additional information that will help you to complete the procedure. CAUTIONS warn you against making an error that could damage the vehicle. WARNINGS remind you to be careful when there is a risk of personal injury. Below are some basic WARNINGS that you should heed when you work on the vehicle’s body. They are not all inclusive, however, and common sense must be used when servicing vehicles. Become familiar with all warning labels.
Always wear safety glasses and other proper protective equipment (gloves, steel-toed shoes, face shields, knee pads, hearing protection) as appropriate to the process. Always maintain firm footing and control of tools. Use only tools that are in good condition, and use them only in the appropriate man- ner. Use safety stands and/or wheel blocks whenever you are underneath the vehicle. Put the transmission in Park and set the parking brake before working on the ve- hicle. Get help when needed to avoid injuries caused by overexertion. Always be aware of the location of other people and potential trip hazards (e.g., air lines, electrical cords, tools).
Be sure that the ignition switch is Off un- less otherwise required by the procedure. Utilimaster recommends that a licensed automotive air-conditioning specialist work on the vehicle’s air-conditioning (HVAC) system. Operate engines only in well-ventilated areas. Keep yourself and your clothing away from the radiator fan, belts, and any mov- ing parts when the engine is running. Avoid breathing A/C refrigerant and lubri- cant vapor or mist. Exposure may irritate eyes, nose, and throat. To remove R-134a from the A/C system use service equip- ment certified to meet the requirements of SAE J2210 (R-134a recycling equipment).
If accidental system discharge occurs, ven- tilate work area before resuming service. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers. Keep hands and other objects clear of the radiator fan blades. The electric fan can start at any time even though the ignition is Off. Disconnect the fan when working under the hood. Avoid contact with hot metal parts, such as the radiator or exhaust system. Do NOT smoke while working on the vehicle. Always remove rings, watches, hanging jewelry, and loose clothing before working on a vehicle. Tie long hair securely behind your head. 11 2001 and Later Aeromaster on Freightliner Chassis—Body Wiring Manual