if you do not have rear a/c then it should be on the condensor. if you do have rear a/c it is on the firewall area.
Schematic:
A/C System Description
System Components
The
Cycling Clutch Orifice Tube (
CCOT )
refrigerant system cycles a compressor (1) on and off in order to maintain the desired cooling. This cycling also prevents evaporator freeze-up. The temperature selector on the
control assembly maintains comfort in the passenger compartment comfort.
A switch that senses low side pressure as an indicator of the evaporator pressure controls the refrigeration cycle, or the on and off operation of the compressor. The cycling pressure switch is the freeze perfection device in the system. The switch also senses
refrigerant pressure on the suction side of the system. This switch is located on a standard service low-side fitting. With air temperatures of
16-26°C (60-80°F) , the increased pressures within the charged air conditioning system closes the contacts of the pressure switch.
When an air conditioning mode is selected, the
compressor clutch coil receives electrical energy. As the compressor reduces the evaporator pressure to approximately
175 kPa (25 psi) , the pressure switch opens, de-energizing the
compressor clutch. The system moves towards equalization and the pressure reaches approximately
315 kPa (46 psi) . Then, the pressure switch contacts close, telling the PCM to recognize the clutch relay. The cycling continues and maintains the evaporator surface temperature at approximately
7°C (45°F) depending on ambient and relative humidity. Higher ambient temperature and higher humidity equal higher discharge temperature.
Some slight increases and decreases of engine speed/power may occur under certain conditions, due to the cycling. This is normal. The system cycles in order to maintain maximum cooling, without evaporator freeze-up.
Additional compressor protection results from the operating characteristics of the low-side cycling pressure system. If a massive discharge occurs in the low side of the system, or the orifice tube becomes plugged, the contacts of the pressure switch may not close due to insufficient low-side pressures. It there is a low charge, insufficient cooling accompanied by rapid
compressor clutch cycling is noticeable at high air temperatures.
When the engine is OFF while the air conditioning system is operating, the
refrigerant in the system flows from the high-pressure side of the expansion tube (orifice) to the low pressure side until the pressure moves towards equalization. This may be detected as a hissing sound for
30-60 seconds . The hissing is normal.
The air conditioning systems available for the vehicle are the following:
- C60 Front Manual Controls, HVAC System
- C69 Rear, HVAC System
Unit Repair Information
For the bench repair procedures of the Harrison HT-6 air conditioning compressor, refer to
HD6/HT6 Air Conditioning Compressor Service Or Unit Repair R-134a .
Here is the removel and install for a front only system:
Expansion (Orifice) Tube Replacement - RPO C60
REMOVAL PROCEDURE
TOOLS REQUIRED
J 26549-E Orifice Tube Remove and Installer
- Recover the refrigerant. Refer to Refrigerant Recovery and Recharging See: Refrigerant\Service and Repair
- Remove the grille.
- Disconnect the evaporator tube from the condenser (1).
- Remove the O-ring seal.
- Cap or plug the open line.
- Use the J 26549-E in order to remove the expansion (orifice) tube (3) from the condenser outlet pipe (2). In the event of difficulty during the removal or a restricted or plugged expansion (orifice) tube, take the following steps:
6.1. Remove as much of any impacted residue as possible.
IMPORTANT : Do not overheat the pipe
6.2. Carefully apply heat with a heat gun (hair drier, epoxy drier, or similar item) approximately
7 mm (0.25 in) from the dimples on the inlet pipe. 6.3. While applying the heat, use the J 26549-E in order to grip the expansion orifice tube. 6.4. Use a turning motion along with a push-pull motion in order to loosen the impacted expansion (orifice) tube.
Remove the tube.
INSTALLATION PROCEDURE
- Use the J 26549-E in order to install the expansion tube (3) into the condenser outlet pipe (2).
- Install the new O-ring seal.
2.1. Coat the O-ring seal with 525 viscosity
refrigerant oil. 2.2. Insert the short screen end of the new orifice into the
evaporator tube.
- Connect the evaporator tube to the condenser.
- Install the grille.
- Charge the system. Refer to Refrigerant Recovery and Recharging See: Refrigerant\Service and Repair
- Inspect the system for leaks. Refer to Leak Testing . See: Testing and Inspection
