Flush Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Warmer engine or ambient temperatures decreases the refrigerant recovery time during the A/C flush procedure.

Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .

Fig 1: View Of TXV

Courtesy of GENERAL MOTORS CORP.

Remove the thermal expansion valve (TXV). Refer to Thermal Expansion Valve Replacement .
Install new O-rings onto the evaporator core and A/C lines. Refer to O-Ring Replacement .
Install the A/C lines into J 45268-110.
Install J 45268-110 onto the evaporator core.

Fig 2: View Of TXV Line Bracket

Courtesy of GENERAL MOTORS CORP.

Install the TXV line bracket.

NOTE: Refer to Fastener Notice .

Install TXV mounting bolts.
Tighten: Tighten the bolts to 3.5 N.m (31 lb in).
Remove the A/C compressor. Refer to Compressor Replacement .

Fig 3: View Of A/C Filter And Check Valve

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The filter inside J 45268-1 is serviceable. Remove and discard the check valve from the filter.

Service the filter with AC Delco P/N GF 470, before each flush.

Fig 4: View Of HVAC Hoses

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Install new O-rings onto the A/C discharge and suction lines. Refer to O-Ring Replacement .

Install the J 45268-13 to the A/C suction line.
Install the J 45268-12 to the A/C discharge line.
Connect the J 45268-1 flush filter to the J 45268-7 flush fitting.
Connect the blue hose from the J 43600 to J 45268-1 flush filter adapter. See Special Tools .
Connect the red hose from the J 43600 to J 45268-8 flush fitting. See Special Tools .

IMPORTANT: Close the valve on the external refrigerant tank, before starting the flush process.

Flush the A/C system. Follow the instructions supplied with the J 43600 . See Special Tools .
Disconnect the red hose from the J 43600 to J 45268-8 flush fitting. See Special Tools .
Disconnect the blue hose from the J 43600 to J 45268-1 flush filter adapter. See Special Tools .
Disconnect the J 45268-1 flush filter from the J 45268-7 flush fitting.
Remove the J 45268-12 from the A/C discharge line.
Remove the J 45268-13 from the A/C suction line.

Fig 5: View Of Drain Oil Bolt On Compressor

Courtesy of GENERAL MOTORS CORP.

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.

If you will reinstall the removed A/C compressor, perform the following procedure:
1. Remove the drain oil bolt from the removed compressor.
2. Drain and properly discard the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
3. Add the total system capacity of PAG oil into the A/C compressor oil drain. Refer to Refrigerant System Capacities .
4. Add one bottle of J 41447 directly to the A/C compressor. See Special Tools .

IMPORTANT: A new service compressor is shipped with a full charge of PAG oil. Refer to Refrigerant System Capacities .

Install the A/C compressor. Refer to Compressor Replacement .

Fig 6: View Of TXV Line Bracket

Courtesy of GENERAL MOTORS CORP.

Remove the TXV mounting bolts.
Remove the TXV line bracket.

Fig 7: View Of TXV

Courtesy of GENERAL MOTORS CORP.

Remove J 45268-110 from the evaporator core.
Remove the A/C lines from J 45268-110.
Inspect the TXV for debris. Clean or replace as needed.
Replace the desiccant bag. Refer to Air Conditioning Refrigerant Desiccant Replacement .
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Leak test the fittings using J 42220 . See Special Tools .