Important: Warmer engine or ambient temperature decreases the refrigerant recovery time during the A/C flush procedure.
- Recover the refrigerant. Refer to
Refrigerant Recovery and Recharging
.
- Remove the orifice tube. Refer to
Expansion (Orifice) Tube Replacement
.
- Connect the A/C lines with the orifice tube removed.
- Remove the A/C compressor. Refer to
Air Conditioning Compressor Replacement
.
- Inspect the end of the suction hose for a suction screen.
- Remove the suction screen, if installed.
- Install the J 45268-3 to the A/C compressor hose assembly.
- Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.
Perform the following procedure:
| Important: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
|
8.1. | Service the filter with ACDelco P/N GF 470, before each flush. |
Connect the J 45268-1 flush filter to the suction port of the J 45268-3 flush adapter.
8.2. | Connect the blue hose from the
J 43600
to the J 45268-1 flush filter adapter. |
8.3. | Connect the red hose from the
J 43600
to the J 45268-3 flush adapter. |
- Reverse flow refrigerant flushing is recommended for desiccant bag failure.
Perform the following procedure and replace the accumulator when the flush procedure is complete.
| Important: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
|
9.1. | Service the filter with ACDelco P/N GF 470, before each flush. |
Connect the J 45268-1 flush filter to the discharge port of the J 45268-3 flush adapter.
9.2. | Connect the blue hose from the
J 43600
to the J 45268-1 flush filter adapter. |
9.3. | Connect the red hose from the
J 43600
to the suction port of the J 45268-3 flush adapter. |
- Flush the front A/C system. Follow the instructions supplied with the
J 43600
.
Close the valve on the external refrigerant tank, before starting the flush process.
Important: Flush the front A/C system before flushing the auxiliary A/C system.
- If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
- Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.
Important: Pinch off the orifice tube in order to prevent refrigerant flow to the front system during the auxiliary system flush.
- Install the pinched orifice tube. Refer to
Expansion (Orifice) Tube Replacement
.
- Remove the auxiliary thermostatic expansion valve (TXV). Refer to
Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement
.
- Install the J 45268-104.
Important: The auxiliary evaporator core can be flushed without totally reassembling into the auxiliary HVAC module.
- Install the auxiliary evaporator core to the A/C lines.
- Raise the vehicle. Refer to
Lifting and Jacking the Vehicle
.
- Connect the auxiliary A/C lines to the auxiliary evaporator core.
- Lower the vehicle.
- Flush the auxiliary A/C system. Follow the instructions supplied with the
J 43600
.
- Raise the vehicle. Refer to
Lifting and Jacking the Vehicle
.
- Remove the auxiliary A/C lines from the auxiliary evaporator core.
- Lower the vehicle.
- Remove the J 45268-104.
- Inspect the TXV for debris.
Clean or replace, as needed.
- Install the auxiliary TXV. Refer to
Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement
.
- Remove the J 45268-3 from the A/C compressor hose assembly.
Important: Flushing will remove all the PAG oil from the A/C system. The A/C system must be replenished with the correct amount of PAG oil.
- Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
- Add back the total system capacity of PAG oil to the A/C compressor. Refer to
Refrigerant System Capacities
.
- If you will be replacing the A/C compressor after flushing the system, perform the following procedure:
• | If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor. |
• | Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to
Refrigerant System Capacities
. |
• | Add the calculated amount to the compressor, as needed. |
Important: Flushing will remove the fluorescent leak detection dye from the A/C system.
- Add one bottle of
J 41447
.
- Install the A/C compressor. Refer to
Air Conditioning Compressor Replacement
.
- Install a new orifice tube. Refer to
Expansion (Orifice) Tube Replacement
.
- Evacuate and recharge the A/C system. Refer to
Refrigerant Recovery and Recharging
.
- Leak test the fittings using the
J 42220
.