Start By:
- Remove the fan motor for the heater and air conditioner. Refer to Disassembly and Assembly, "Fan Motor (Air Conditioner and Heater) - Remove".
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
Note: Put identification marks on all hoses and on all wires for installation purposes. Plug the hoses. This will help to prevent fluid loss and this will help to keep contaminants from entering the system.
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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. |
- Open the engine hood.
- 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.
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Illustration 1 g00830315 - Disconnect electrical connector (1).
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Illustration 2 g00830318 - Disconnect two heater lines (2). Place the lines away from the heater coil and the evaporator coil.
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Illustration 3 g00830322 - Remove bolt (3) and the clip which holds the air conditioner lines in place.
- Disconnect two air conditioner lines (4). Place the lines away from the heater coil and the evaporator coil.
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Illustration 4 g00830337 - Open access door (5) on the outside of the cab.
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Illustration 5 g00830338 - Remove filter (6).
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Illustration 6 g00830339 - Remove two bolts (7) and the washers.
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Illustration 7 g00840861 - Remove bolt (8) and the washer. Carefully remove the heater coil and the evaporator coil assembly (9) from the cab.
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Illustration 8 g00840871 - Disconnect electrical connectors (10). Cut the wire ties which hold the wire assembly in place.
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Illustration 9 g00840873 - Disconnect electrical connectors (11).
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Illustration 10 g00840877 - Remove two bolts (12) and the washers. Remove cover (13).
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Illustration 11 g00840879 - Remove eight screws (14) which hold the housing assembly together.
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Illustration 12 g00830370 - Separate the housing assembly.
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Illustration 13 g00840881 - Remove evaporator coil (15).
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Illustration 14 g00840901 - Remove foam insert (16) from fittings (17) for the heater coil.
- Remove the heater coil.
