VALVE GP-CONTROL 8J2419 - 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.
Never weld or solder any charged components.
A visual inspection is essential before conducting any performance tests or before conducting any service to the air conditioning system or to the heating system.
Inspect the fresh air filter and clean the fresh air filter.
Inspect the recirculation air filter and clean the recirculation air filter.
Inspect the condenser and the evaporator.
Check for any type of restriction that will obstruct the air flow. Check for dirt, insects, plastic bags, and other obstructions.
Make sure that both fan motors are running. Check for restrictions.
Inspect the condensate drain tube on the evaporator. Confirm that the drain plug is not obstructed.
Inspect refrigerant lines and hoses for damage from excessive heat or rubbing. Check for oily surfaces along hose and coupling connections. The presence of oil can be an indication of a refrigerant leak. Refer to Testing and Adjusting, UENR4125, "Refrigerant Leakage – Test".