AC Accumulator

Remove and replace the AC accumulator/drier on a 2008 Dodge Viper, including refrigerant recovery, line disconnection, and system recharge.

Warnings

Tools required

Parts

• AC accumulator/drier × 1 — Use OEM specification
• O-ring kit for AC lines × 1 — Use OEM specification
• PAG 46 oil × 1 — Check accumulator oil capacity specification

Fluids

• ac_refrigerant

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely if recently operated
3. Verify AC recovery machine is certified and functioning properly
4. Prepare new accumulator, O-rings, and required tools within reach

Procedure

1. 1

   Recover AC refrigerant
   Connect AC recovery machine to service ports on the vehicle. Follow machine manufacturer procedures to recover all refrigerant from the system. Record the amount of refrigerant recovered for recharge reference. Allow system to fully depressurize and verify zero pressure on manifold gauges before proceeding.
2. 2

   Access accumulator location
   Open hood and secure in upright position. The AC accumulator is located on the passenger side of the engine bay, mounted to the inner fender near the firewall. Identify the cylindrical accumulator with inlet and outlet lines attached.
3. 3

   Disconnect inlet refrigerant line
   Locate the inlet line connection at the top of the accumulator (coming from evaporator). Use appropriate refrigerant line disconnect tool to release the quick-connect fitting. Some residual refrigerant or oil may drain; have a clean rag ready. Cap the open line immediately to prevent moisture and contamination entry.
4. 4

   Disconnect outlet refrigerant line
   Locate the outlet line connection on the accumulator (going to compressor). Use refrigerant line disconnect tool to release the quick-connect fitting. Cap the open line immediately. Inspect both line fittings for damage or wear to O-rings.
5. 5

   Disconnect pressure switch harness
   Locate the low-pressure switch or sensor on the accumulator body. Press the tab and disconnect the electrical harness connector. Move wiring aside to prevent damage during removal.
6. 6

   Remove accumulator mounting bracket
   Locate the mounting bracket bolt(s) securing the accumulator to the inner fender structure. Remove the mounting hardware and note orientation of any rubber isolation bushings or brackets for reinstallation.
7. 7

   Remove accumulator assembly
   Carefully lift the accumulator up and out of the mounting bracket. Keep accumulator upright to minimize oil spillage. Place on clean work surface with both ports facing upward.
8. 8

   Drain and measure oil
   Invert the old accumulator over a graduated container and allow all oil to drain completely. Measure and record the amount of oil drained. The new accumulator will require this same amount of fresh PAG 46 oil, minus any oil that came pre-charged in the new unit (verify new unit specification).
9. 9

   Prepare new accumulator
   Remove protective caps from new accumulator inlet and outlet ports. Add the correct amount of fresh PAG 46 oil through the inlet port (total system oil minus any pre-charge in new unit, accounting for oil drained from old unit). Install new O-rings on both port connections, lightly lubricating with refrigerant oil.
10. 10

    Install new accumulator
    Position new accumulator into mounting bracket, ensuring proper orientation with inlet port toward evaporator line and outlet toward compressor line. Verify any directional arrows or labels on accumulator body match correct flow direction. Install mounting bracket hardware and secure accumulator firmly.
11. 11

    Connect refrigerant lines
    Remove caps from refrigerant lines. Connect inlet line to top port of accumulator, pushing firmly until quick-connect fitting clicks into place. Tug gently to verify secure connection. Connect outlet line to accumulator, ensuring quick-connect clicks fully. Verify both connections are secure and O-rings are properly seated.
12. 12

    Reconnect pressure switch
    Reconnect electrical harness to low-pressure switch on accumulator body. Ensure connector clicks fully into place and locking tab engages.
13. 13

    Evacuate AC system
    Connect vacuum pump to AC service ports using manifold gauge set. Evacuate system to at least 29 inches of mercury vacuum. Hold vacuum for minimum 30 minutes to remove all moisture and air from system. Monitor gauges for vacuum decay; system should hold vacuum without loss, indicating no leaks.
14. 14

    Recharge AC system
    Using AC recharge machine, add R-134a refrigerant to system per factory specification (refer to underhood AC charge label for exact capacity — verify against the vehicle-specific specification before charging). Monitor pressures during charging. If UV dye was not present in recovered refrigerant, add appropriate amount during recharge for future leak detection.
15. 15

    Test AC operation
    Start engine and turn AC system to maximum cold setting with blower on high. Allow system to run for 5 minutes. Verify compressor engages and cycles properly. Check that low-side pressure is 25-35 psi and high-side pressure is 200-250 psi at idle with ambient temperature around 75-85°F. Verify cold air discharge from vents. Inspect all connections for leaks using leak detector or soap solution.

Reassembly

1. Reassembly is covered in the installation steps above
2. Ensure all refrigerant line connections are fully seated and secure
3. Verify electrical connector to pressure switch is fully engaged
4. Confirm accumulator mounting is secure and does not vibrate against body

Verification

• Run AC system for 10 minutes and verify consistent cold air output
• Check low-side pressure is within 25-35 psi range during operation
• Check high-side pressure is within 200-250 psi range during operation at idle
• Inspect all connections for refrigerant leaks using electronic leak detector or UV light if dye was added
• Verify compressor cycles on and off normally as controlled by pressure switch
• Confirm no unusual noises from AC system operation

Related trouble codes on this vehicle

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