320D2 GC Excavator Machine Systems Heating and Air Conditioning Unit - Remove and Install Caterpillar


Heating and Air Conditioning Unit - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Start By:

  1. Remove the storage box and covers.

------ WARNING! ------

Personal injury can result from contact with refrigerant.

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 precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.

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.

Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.


Note: Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

  1. Recover the air conditioner refrigerant from the air conditioner system. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct procedure. Refer to Special Publication, NEDG5065, "Air Conditioning Tools" for the correct tools.


    Illustration 1g01217534

  2. Remove sheet assembly (1).


    Illustration 2g01302454

  3. Disconnect hose assemblies (2) and (3).


    Illustration 3g01302455

  4. Disconnect harness assemblies (5) and (6). Disconnect harness assemblies (8) from clips (7). Remove bolts (4). Position support assembly (9) and harness assemblies (8) to the side.


    Illustration 4g01302457


    Illustration 5g01302460

  5. Remove ducts (10) and (11). Remove cover (12). Disconnect harness assemblies (15), (16), and (17). Remove bolts (14). Remove heating and air conditioning unit (13).

Installation Procedure

Note: Cleanliness is an important factor. Before the installation procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.



    Illustration 6g01302460


    Illustration 7g01302457

  1. Position heating and air conditioning unit (13). Install bolts (14). Tighten bolts (14) to a torque of 22 ± 2 N·m (16 ± 2 lb ft). Connect harness assemblies (15), (16), and (17). Install cover (12). Install ducts (10) and (11).


    Illustration 8g01302455

  2. Position support assembly (9) and harness assemblies (8) . Install bolts (4). Connect harness assemblies (8) onto clips (7). Connect harness assemblies (5) and (6).


    Illustration 9g01302454

  3. Connect hose assemblies (2) and (3). Tighten hose assembly (2) to a torque of 10 ± 1 N·m (88 ± 9 lb in).


    Illustration 10g01217534

  4. Install sheet assembly (1).

  5. Charge the air conditioner system with refrigerant. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct procedure. Refer to Special Publication, NEDG5065, "Air Conditioning Tools" for the correct tools.

  6. Check the coolant level.

End By:

  1. Install the storage box and covers.

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