This procedure covers the removal and replacement of the AC receiver/drier on a 2014 Ram 2500 with 6.7L Cummins diesel engine, including refrigerant recovery, system evacuation, and recharging.

Warnings

Tools required

Parts

• AC Receiver/Drier assembly × 1 — Use OEM specification
• AC O-ring kit × 1 — Use OEM specification
• R-134a refrigerant × 1 — Approximately 2.5 lbs
• PAG 46 compressor oil × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Ensure engine is cool before beginning work
3. Verify AC system has not been recently operated (should be ambient temperature)
4. Connect AC recovery machine to service ports per manufacturer instructions
5. Completely recover all refrigerant from the system and record amount recovered
6. Ensure proper ventilation in work area

Procedure

1. 1

   Locate and access receiver/drier
   The receiver/drier is located on the right side of the condenser assembly at the front of the vehicle. It is mounted vertically with a bracket. Inspect the area for any obstructions and verify access to both AC line connections and mounting hardware.
2. 2

   Disconnect AC lines from receiver/drier
   Using appropriate wrenches, disconnect the AC line fittings from the top and bottom of the receiver/drier. Cap or plug all open AC line connections immediately to prevent moisture and contamination from entering the system. Remove and discard old O-rings from the line fittings.
   ⚠Even after recovery, residual refrigerant may remain in lines. Have rags ready to catch any oil that may drip from connections.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
3. 3

   Remove receiver/drier mounting hardware
   Remove the mounting bracket bolts securing the receiver/drier to the condenser or frame. Support the receiver/drier while removing the final fastener to prevent it from falling.
   Torque spec

   Receiver Drier Bolts10 Nm (7 lb-ft)
4. 4

   Remove receiver/drier assembly
   Carefully extract the receiver/drier from its mounting location. Keep the unit upright to minimize oil spillage. Drain and measure any oil from the old receiver/drier into a clean container. Note the amount for replacement calculation.
5. 5

   Prepare new receiver/drier
   Remove the new receiver/drier from its sealed packaging. Do not remove shipping caps until immediately before installation. Add the appropriate amount of new PAG 46 oil to the new receiver/drier (typically same amount as drained from old unit, or 2 oz if unable to measure). Verify the new unit matches the old unit in configuration and fitting locations.
6. 6

   Install new O-rings
   Install new O-rings on all AC line fittings. Lightly coat each O-ring with clean PAG 46 oil to ensure proper sealing and ease installation. Inspect O-rings for any damage or debris before installation.
   ℹ️Using old or dry O-rings will result in system leaks. Always use new O-rings coated with refrigerant oil.
7. 7

   Position and mount new receiver/drier
   Remove shipping caps from the new receiver/drier immediately before installation. Position the receiver/drier in the mounting bracket, ensuring proper orientation with inlet and outlet ports aligned to their respective lines. Install and hand-tighten mounting bolts.
   Torque spec

   Receiver Drier Bolts10 Nm (7 lb-ft)
8. 8

   Connect AC lines
   Remove caps from AC lines and quickly connect both AC line fittings to the receiver/drier. Hand-tighten first, then torque to specification using a torque wrench. Ensure lines are properly routed without kinks or excessive tension.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
9. 9

   Evacuate AC system
   Connect vacuum pump to AC system service ports. Evacuate system to at least 29 inches of mercury vacuum. Maintain vacuum for minimum 30-45 minutes to remove all moisture and air. Monitor vacuum gauge for any decay that would indicate a leak. If vacuum holds steady, proceed to charging.
10. 10

    Recharge AC system
    Using AC manifold gauges and refrigerant scale, charge the system with the specified amount of R-134a refrigerant (typically 2.25-2.5 lbs for this vehicle, verify on underhood label). Charge through the low-side service port with engine running and AC system on maximum cooling. Monitor pressures throughout charging process.
11. 11

    Leak test system
    With system fully charged, use electronic leak detector to check all connections at the receiver/drier for leaks. Also check service port caps and surrounding connections. Allow system to stabilize for 5-10 minutes, then recheck pressures to ensure they remain stable.

Reassembly

1. Verify all AC line connections are properly torqued and leak-free
2. Ensure receiver/drier mounting bolts are secure
3. Verify no tools or parts were left in engine compartment
4. Install service port caps finger-tight

Verification

• Start engine and turn AC to maximum cooling with blower on high
• Verify cold air is produced at all vents within 2-3 minutes
• Check that compressor clutch engages and cycles normally
• Monitor AC pressures: low side should be 25-45 PSI and high side should be 200-275 PSI at idle with ambient temperature around 75-85°F
• Verify no unusual noises from AC compressor or system
• Recheck all connections for leaks after system has been operating for 10 minutes
• Test AC performance during road test to ensure adequate cooling under load

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