How to Replace the A/C Compressor on a 2018 Dodge Charger (R-134a System)
Step-by-step instructions with required tools/parts, safety tips, and recharge guidance
How to Replace the A/C Compressor on a 2018 Dodge Charger (R-134a System)
Step-by-step instructions with required tools/parts, safety tips, and recharge guidance
🔧 Charger - A/C Compressor Replacement
Replacing the A/C compressor on your Charger involves safely recovering refrigerant, removing the drive belt, disconnecting the A/C lines, swapping the compressor, then vacuuming and recharging the system. The exact parts list and torque specs depend on whether the old compressor failed internally and contaminated the system.
Difficulty Level: Advanced | Estimated Time: 3-6 hours
⚠️ Safety & Precautions
- ⚠️ Refrigerant is under high pressure—do not loosen A/C lines unless the system is fully recovered with proper equipment.
- ⚠️ Wear eye protection and gloves; refrigerant/oil can cause frostbite and eye injury.
- ⚠️ Keep hands clear of the belt path; the tensioner is spring-loaded.
- ⚠️ If you’ll unplug the compressor clutch/pressure sensor connectors, disconnect the battery negative cable first.
🔧 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
- 3/8" drive ratchet
- 1/2" drive ratchet
- Socket set 8mm-18mm
- Serpentine belt tool (specialty)
- Torque wrench 10-150 ft-lbs
- Trim clip removal tool
- Line wrench set (flare nut) 13mm-19mm
- A/C manifold gauge set (specialty)
- Vacuum pump (specialty)
- Refrigerant recovery machine (specialty)
- R-134a refrigerant scale (specialty)
- UV leak detection light (optional)
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- A/C compressor - Qty: 1
- A/C compressor O-ring seal set - Qty: 1
- PAG A/C oil (manufacturer-specified type) - Qty: 1
- R-134a refrigerant - Qty: 1-3 cans
- Receiver/drier or desiccant element - Qty: 1 Recommended if system was open
- A/C condenser - Qty: 1 Only if contaminated/failed
- Serpentine belt - Qty: 1 Replace if cracked/glazed
đź“‹ Before You Begin
- Park on level ground, set the parking brake, and chock the rear wheels.
- Have the refrigerant professionally recovered if you don’t have a recovery machine.
- If you’ll be unplugging electrical connectors near the compressor, disconnect the battery negative cable using a 10mm socket.
- Take a photo of the belt routing.
🔨 Step-by-Step Instructions
Follow these steps in order:
Before I give you the exact step-by-step with correct torque specs and the right “replace these parts too” guidance, answer these 2 quick questions:
- Did the old compressor fail loudly/lock up or did it just stop cooling (no noise)? This determines whether you must replace the condenser/receiver-drier and flush lines due to metal contamination.
- Will you be using a recovery machine + vacuum pump + manifold gauges yourself, or will a shop handle the recover/evac/recharge portion?
Once you reply, I’ll give you the exact procedure path for your Charger (including what to replace, what to flush, and the torque specs at each fastener/line connection).
âś… After Repair
- Verify the system holds vacuum, then recharge by weight (not by pressure alone).
- Confirm vent temperature drop and stable low/high side pressures.
- Check for leaks at every opened connection.
đź’° DIY vs Shop Cost
Shop Cost: $900-$1,800 (parts + labor)
DIY Cost: $250-$900 (parts only)
You Save: $650-$900 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.
🎯 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.
