🔧 Challenger - A/C Compressor Replacement

Replacing the A/C compressor on your Challenger is a mix of mechanical work (belt + mounting + lines) and A/C service work (recovering refrigerant, pulling vacuum, and recharging). The most important part is doing the refrigerant handling correctly and preventing leaks by replacing seals (O-rings) and adding the correct oil amount/type.

Difficulty Level: Advanced | Estimated Time: 3-6 hours

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⚠️ Safety & Precautions

• ⚠️ Refrigerant must be recovered with proper equipment before opening any A/C line; venting refrigerant is unsafe and illegal.
• ⚠️ Wear safety glasses and gloves; liquid refrigerant can cause frostbite on contact.
• ⚠️ Do not smoke or use open flames near A/C service; refrigerant/oil mist is hazardous.
• ⚠️ Let the engine cool before working near the belt drive and exhaust components.
• ⚠️ Disconnect the negative battery cable before unplugging the compressor connector.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Trim clip removal tool
• Ratchet (3/8")
• Ratchet (1/2")
• Socket set (metric)
• Torque wrench (10–100 ft-lbs)
• Serpentine belt tool (specialty)
• Line wrench set (metric)
• Pick set
• Drain pan
• Shop rags
• A/C manifold gauge set (specialty)
• Vacuum pump (specialty)
• Refrigerant recovery machine (specialty)
• A/C refrigerant scale (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor (correct for your Challenger) - Qty: 1
• A/C compressor manifold O-ring/seal kit - Qty: 1
• A/C system refrigerant (type per underhood label) - Qty: 1
• A/C compressor oil (type/viscosity per underhood label) - Qty: 1
• Receiver/drier or desiccant service kit (recommended) - Qty: 1
• Serpentine belt (optional if worn/cracked) - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Open the hood and locate the A/C underhood label; write down the refrigerant type and factory charge amount.
• Disconnect the negative battery cable using the correct size socket for the terminal clamp.
• Plan for refrigerant recovery/evac/recharge: you need a recovery machine + vacuum pump + scale, or you’ll need a shop to do recover and recharge.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm refrigerant type and failure type

• Read the underhood A/C label and note whether it specifies R-134a or R-1234yf.
• Look at your symptoms: if the compressor seized, made loud grinding, or the system has black/metal debris, the repair may also require more parts (like the condenser and expansion valve) and a thorough flush.

Step 2: Recover the refrigerant (required before opening lines)

• Connect the A/C manifold gauge set (specialty) to the high/low service ports.
• Use a refrigerant recovery machine (specialty) to recover the refrigerant completely.
• If you don’t have this machine, stop here. Have a shop recover the refrigerant, then continue with the mechanical steps below.

Step 3: Raise the front and remove lower shielding (if equipped)

• Lift the front using a floor jack (rated 3-ton minimum) and support it with jack stands (rated 3-ton minimum).
• Remove any lower splash shields using a trim clip removal tool and socket set (metric).

Step 4: Remove serpentine belt from the compressor

• Use a serpentine belt tool (specialty) to rotate the belt tensioner and slip the belt off the A/C compressor pulley.
• Take a photo of belt routing first.

Step 5: Disconnect the compressor electrical connector

• Unplug the compressor connector by releasing the lock tab with a pick set (a pick is a small hooked tool used to lift locking tabs).
• Move the harness aside so it can’t get pinched.

Step 6: Remove the A/C lines from the compressor

• Place a drain pan underneath and wrap the area with shop rags to catch any oil.
• Use a line wrench set (metric) to loosen the A/C line fasteners/fittings at the compressor.
• Immediately remove and discard the old O-rings using a pick set.
• Cap/cover open lines to keep dirt and moisture out.

Step 7: Remove the A/C compressor

• Support the compressor by hand and remove its mounting bolts using a ratchet (3/8") and socket set (metric).
• Remove the compressor from the bracket area carefully (it’s heavier than it looks).

Step 8: Prepare the new compressor (oil and seals)

• Verify the new compressor matches the old one (mounts and ports).
• Install new O-rings from the A/C compressor manifold O-ring/seal kit.
• Lightly lubricate the O-rings with the correct A/C compressor oil so they don’t tear during assembly.
• Add the correct oil amount/type as required for your Challenger’s system and what was lost; use the underhood label/service info for specs.

Step 9: Install the new compressor

• Position the compressor and start all mounting bolts by hand to avoid cross-threading.
• Tighten the mounting bolts using a ratchet (3/8") and socket set (metric), then use a torque wrench (10–100 ft-lbs) to Torque to factory specification.

Step 10: Reconnect A/C lines

• Install the line/manifold block onto the compressor with the new O-rings in place.
• Tighten the line fasteners using a line wrench set (metric), then use a torque wrench (10–100 ft-lbs) to Torque to factory specification.

Step 11: Reconnect electrical connector and reinstall belt

• Reconnect the compressor electrical plug until it clicks.
• Route the belt correctly and use the serpentine belt tool (specialty) to set belt tension and slip the belt back on.

Step 12: Reinstall shields and lower the car

• Reinstall splash shields using the trim clip removal tool and socket set (metric).
• Lower the car from the jack stands (rated 3-ton minimum) using the floor jack (rated 3-ton minimum).

Step 13: Evacuate (vacuum) and recharge the A/C system

• Reconnect the A/C manifold gauge set (specialty).
• Use a vacuum pump (specialty) to pull vacuum and confirm it holds (this checks for leaks).
• Recharge using the correct refrigerant type and the exact factory-specified weight using an A/C refrigerant scale (specialty).

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✅ After Repair

• Reconnect the negative battery cable using the correct size socket and ensure it’s tight.
• Start the engine and turn A/C on MAX; verify the clutch/command engages and the air gets cold.
• Watch the manifold gauge readings for abnormal high/low pressures (indicates under/overcharge or airflow issues).
• Check all fittings for oily residue or hissing that would indicate a leak.

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💰 DIY vs Shop Cost

Shop Cost: $1,200-$2,500 (parts + labor, more if contamination/flush needed)

DIY Cost: $450-$1,200 (parts only; assumes you have A/C service equipment)

You Save: $750-$1,300 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.

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Two quick questions so I can tailor this exactly to your Challenger:

• What refrigerant does your underhood label specify: R-134a or R-1234yf?
• Did the old compressor seize/grind or did it just stop cooling (no loud noise)?