307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Visual Inspection Caterpillar


Visual Inspection
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------ WARNING! ------

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.


Before you conduct a performance check of the air conditioning system, the following items should be checked:

  1. Check the condenser and the evaporator for any type of restriction that will obstruct air flow. Check for dirt, insects, plastic bags, etc.

  2. Clean the fresh air filters and clean the recirculation filters.

  3. Check for a loose belt on the compressor.

  4. Check the moisture indicator on the receiver-dryer. If the indicator is pink or white, there is moisture in the system. Replace the receiver-dryer or the in-line dryer. Refer to Disassembly and Assembly, "Receiver (Refrigerant Dryer) Remove and Install" for instructions on replacing the receiver-dryer. If the moisture indicator is blue, the system is normal.

  5. Check the drain tube on the evaporator. The drain plug should not be obstructed.

Information System:

307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating General Troubleshooting Information
312C, 322C, 325C and 330C Excavators and TK1051 Track Feller Buncher Air Conditioning and Heating Machine Preparation for Troubleshooting
C32 Marine Engines Transmission Oil Temperature Sensor Open or Short Circuit - Test
C7 Engines for Caterpillar Built Machines Finding Top Center Position for No. 1 Piston
C32 Marine Engines Switch Circuits - Test
C32 Marine Engines Injector Solenoid Circuit - Test
C32 Marine Engines Indicator Lamp Circuit - Test
C27 and C32 Industrial and Petroleum Engines Engine Temperature Sensor Open or Short Circuit - Test
307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Heating System Troubleshooting
C7 Engines for Caterpillar Built Machines Engine Oil Pressure - Test
C7 Engines for Caterpillar Built Machines Turbocharger - Inspect
C7 Engines for Caterpillar Built Machines Fuel System Pressure - Test
307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Air Conditioning E43 - Damper (Air Outlet)
311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Refrigerant System - Evacuate
3412E Petroleum Engine Auxiliary Temperature Sensor Circuit - Test
311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Refrigerant System - Charge
3500 and 3500B Engines Aftercooler Core - Inspect/Clean
C7 Engines for Caterpillar Built Machines Cooling System - Test
2005/01/17 New Bearings for the Engine Oil Pump are Available {1304}
C9.3 Tier 4 Final Engines Fuel Filter Base
3412E Petroleum Engine Intermittent Engine Shutdown
3412E Petroleum Engine Diagnostic Code Cross Reference
3508B, 3512B and 3516B Generator Set Engines Engine Oil Sequence Valves - Remove and Install
311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Manifold Gauge Set (Refrigerant) - Remove