TUBE 5089060 - Caterpillar

Personal injury can result from contact with refrigerant.This system is under pressure at all times, even if the engine is not running. Heat should never be applied to a charged system.Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.Always use caution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, evacuate the system recovering the refrigerant before removing the fitting.Personal injury or death can result from inhaling refrigerant through a lit cigarette.Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.Before any checks of the air conditioning and heating system are made, move the machine to a smooth horizontal surface. Lower all implements to the ground. Make sure the transmission is in neutral or park and that the parking brake is engaged. Keep all other personnel away from the machine or where they can be seen.
Personal injury can result from hot coolant. Any contact with hot coolant or with steam can cause severe burns. Allow cooling system components to cool before the cooling system is drained.
In order to conduct a performance of the heating system, perform the following procedure.
Run the engine at 1000 rpm (low idle speed) until the engine coolant temperature is in the normal operating range.
Adjust the temperature control knob to the hottest position.
Put the fan switch in the HIGH position on heat.
Check the system for normal operating conditions.
The temperature of the air that is flowing from the louvers (air ducts) should be warm.
The temperature of the air should be easily controllable by the control panel in the dash.
There should not be a smell of coolant that is present in the cab.If any of the three items are not working properly, refer to Troubleshooting section of this manual.