AC Receiver/Drier

Remove and replace the AC receiver/drier on a 2023 Chevrolet Bolt EUV, including refrigerant recovery, component replacement, and system recharge.

Warnings

Tools required

Parts

• AC receiver/drier assembly × 1 — Use OEM specification
• AC line O-ring kit × 1 — Use OEM specification
• PAG oil for electric vehicle compressor × 1 — Use OEM specification for EV systems

Fluids

• R-1234yf refrigerant

Preparation

1. Park vehicle on level surface and apply parking brake
2. Ensure vehicle has been off for at least 30 minutes to allow high voltage system to settle
3. Disconnect 12V negative battery terminal and wait 2 minutes for airbag system discharge
4. Raise vehicle on lift or support securely on jack stands if additional underbody access is needed
5. Locate receiver/drier assembly in engine bay near condenser on driver side
6. Connect R-1234yf recovery machine to AC service ports following manufacturer instructions

Procedure

1. 1

   Recover refrigerant from AC system
   Using certified R-1234yf recovery equipment, connect to both high and low side service ports. Follow machine instructions to completely recover all refrigerant from the system. Record the amount recovered for comparison during recharge. Ensure recovery is complete before proceeding.
2. 2

   Remove underhood cover panels
   Remove any plastic engine covers or cowl panels that obstruct access to the receiver/drier. These are typically secured with push clips or fasteners. Set aside for reinstallation.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)
3. 3

   Disconnect electrical connector (if equipped)
   If the receiver/drier has a pressure switch or sensor, press the locking tab and disconnect the electrical connector. Move wiring harness aside to prevent damage.
4. 4

   Disconnect AC line fittings
   Using appropriate line wrenches to prevent rounding, loosen and disconnect both AC line fittings from the receiver/drier. Cap or plug all open ports immediately to prevent moisture and contamination entry. Inspect O-rings and discard. Small amounts of residual oil may drain from lines.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
5. 5

   Remove receiver/drier mounting hardware
   Remove the mounting bolts securing the receiver/drier to its bracket on the condenser or frame rail. Support the receiver/drier while removing the final fastener. Note mounting orientation for proper reinstallation.
   Torque spec

   Receiver Drier Bolts10 Nm (7 lb-ft)
6. 6

   Remove receiver/drier assembly
   Carefully extract the receiver/drier from its mounting location. Inspect the mounting bracket for damage or corrosion. Keep the old unit upright and drain any remaining oil into a graduated container to measure the amount for replacement.
7. 7

   Prepare new receiver/drier
   Remove the new receiver/drier from its sealed packaging only when ready to install. Remove shipping caps from ports. Add the appropriate amount of PAG oil specified for EV compressor systems (typically matching the amount drained from old unit, plus any system capacity loss). Install new O-rings on both port fittings and apply a thin coat of PAG oil to O-rings.
8. 8

   Install new receiver/drier
   Position the new receiver/drier in the mounting bracket ensuring proper orientation. Thread mounting bolts by hand first to ensure proper alignment, then tighten to specification.
   Torque spec

   Receiver Drier Bolts10 Nm (7 lb-ft)
9. 9

   Connect AC line fittings
   Remove caps from AC lines and receiver/drier ports. Verify new O-rings are properly seated in fittings. Thread fittings by hand to prevent cross-threading, then tighten to specification using line wrenches.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
10. 10

    Reconnect electrical connector
    If equipped with a pressure switch or sensor, reconnect the electrical connector ensuring it clicks securely into place. Verify locking tab is fully engaged.
11. 11

    Reinstall covers and reconnect battery
    Reinstall any underhood covers or panels removed earlier. Reconnect the 12V negative battery terminal. Ensure all tools and parts are removed from engine bay.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)
12. 12

    Evacuate AC system
    Connect vacuum pump or AC machine in vacuum mode. Evacuate the system to 29+ inches of mercury (500 microns or better). Hold vacuum for at least 30 minutes to verify system integrity and remove all moisture. If vacuum does not hold, inspect for leaks.
13. 13

    Recharge AC system
    Using the R-1234yf machine, recharge the system with the amount of refrigerant specified on the underhood label (typically 490-530 grams for Bolt EUV). Add refrigerant through the low-side port. Monitor system pressures during charging.

Reassembly

1. Verify all AC line fittings are tightened to proper torque specification
2. Ensure all electrical connectors are fully seated and locked
3. Double-check that all underhood covers and panels are reinstalled
4. Confirm 12V battery is reconnected and secured

Verification

• Start vehicle and turn AC to maximum cold and highest fan speed
• Allow system to run for 5-10 minutes and verify cold air output from vents
• Check AC system pressures: low side should be 25-40 PSI, high side 150-250 PSI at idle with ambient temperature 70-80°F
• Inspect all fittings for signs of refrigerant leaks using electronic leak detector or UV dye
• Verify compressor cycles on and off normally
• Check that vent temperature reaches 40-50°F or lower
• Confirm no unusual noises from AC system components
• Verify pressure switch or sensor is functioning if equipped (no warning lights)

Related trouble codes on this vehicle

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