🔧 TLX - A/C Compressor Replacement

Replacing the A/C compressor involves safely recovering the refrigerant, removing the drive belt, swapping the compressor and sealing O-rings, then evacuating and recharging the system. This is needed when the compressor is seized, noisy, leaking, or not pumping refrigerant correctly.

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

---

⚠️ Safety & Precautions

• ⚠️ Refrigerant must be recovered with proper equipment; venting refrigerant is unsafe and illegal.
• ⚠️ Do not open A/C lines until refrigerant is fully recovered (frostbite/eye injury risk).
• ⚠️ Keep dirt out of open A/C ports; cap lines immediately after disconnecting.
• ⚠️ Support your TLX with jack stands; never work under a car on a jack.
• ⚠️ Disconnect the negative battery terminal if your hands/tools will be near wiring or the radiator fans.

---

🔧 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
• 19mm socket
• 3/8" drive ratchet
• 1/2" drive ratchet
• 3/8" drive extension set
• 10mm socket
• 12mm socket
• 14mm socket
• Serpentine belt tool (specialty)
• Torque wrench (10-80 ft-lb range)
• Trim clip remover tool
• Flat-blade screwdriver
• Manifold gauge set for R-134a (specialty)
• Vacuum pump (specialty)
• Refrigerant recovery machine (specialty)
• Refrigerant scale (specialty)
• Oil measuring cup (specialty)
• A/C line plug/cap kit (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor assembly - Qty: 1
• A/C compressor O-ring set - Qty: 1
• PAG A/C compressor oil (R-134a compatible) - Qty: 1
• R-134a refrigerant - Qty: 1 service charge
• Serpentine drive belt - Qty: 1 Replace if cracked or oil-soaked
• A/C receiver/drier or desiccant service kit - Qty: 1 Recommended if system was open long

---

📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Have the refrigerant professionally recovered using a refrigerant recovery machine (specialty) (a machine that safely removes refrigerant into a tank).
• Let the engine cool fully before working near the radiator and belts.
• Disconnect the battery negative cable using a 10mm socket if you’ll be near the cooling fan wiring.
• Assumption: Your TLX uses R-134a refrigerant (common for this model year).

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Recover the refrigerant

• Connect an R-134a manifold gauge set (specialty) to the high and low service ports.
• Use a refrigerant recovery machine (specialty) to fully recover the refrigerant from the system.
• Confirm both gauges read near 0 psi before opening any A/C line.

Step 2: Raise the front and remove the lower splash shield

• Lift the front with a floor jack (rated 3-ton minimum) and set it on jack stands (rated 3-ton minimum).
• Remove the lower engine splash shield fasteners using a trim clip remover tool and 10mm socket.
• Set fasteners aside in a tray so nothing gets lost.

Step 3: Remove the serpentine belt

• Place a serpentine belt tool (specialty) on the belt tensioner and rotate it to relieve belt tension.
• Slip the belt off the A/C compressor pulley, then remove the belt from the rest of the pulleys.
• Tip: Take a photo of belt routing.

Step 4: Disconnect the compressor electrical connector

• Locate the compressor connector and unplug it by hand; use a flat-blade screwdriver gently if the lock tab is stubborn.

Step 5: Remove the A/C lines from the compressor

• Place shop towels under the compressor to catch any oil.
• Use a 10mm socket to remove the line retaining bolt(s) at the compressor manifold.
• Carefully wiggle the lines straight out; do not pry hard or bend the aluminum tubes.
• Immediately cap/plug the open lines using an A/C line plug/cap kit (specialty).
• Torque on install: Torque to 12 N·m (9 ft-lb) for the line retaining bolt(s).

Step 6: Remove the A/C compressor mounting bolts

• Support the compressor with one hand while removing bolts.
• Use a 12mm socket and 14mm socket (varies by position) with a 3/8" drive ratchet and extensions to remove the compressor mounting bolts.
• Lower the compressor out from underneath the engine bay.
• Torque on install: Torque to 25 N·m (18 ft-lb) for compressor mounting bolts.

Step 7: Prep the new compressor (oil + O-rings)

• If the new compressor comes pre-filled, confirm oil amount matches the compressor instructions.
• If oil needs to be set, measure using an oil measuring cup (specialty) and add the correct amount of PAG A/C compressor oil (R-134a compatible).
• Replace the A/C line O-rings with the new ones from the A/C compressor O-ring set.
• Lightly coat each O-ring with clean PAG oil before installation so it doesn’t tear.
• Tip: Never reuse old O-rings.

Step 8: Install the new compressor

• Position the compressor and start all mounting bolts by hand to avoid cross-threading.
• Tighten mounting bolts using a torque wrench: Torque to 25 N·m (18 ft-lb).
• Reconnect the electrical connector until it clicks.

Step 9: Reinstall the A/C lines

• Remove the caps/plugs and immediately insert the lines squarely into the compressor ports.
• Install the retaining bolt(s) using a 10mm socket.
• Tighten with a torque wrench: Torque to 12 N·m (9 ft-lb).

Step 10: Reinstall the serpentine belt

• Route the belt according to your photo.
• Rotate the tensioner using the serpentine belt tool (specialty) and slip the belt onto the last pulley.
• Visually confirm the belt is seated in every pulley groove.

Step 11: Reinstall the splash shield and lower the car

• Reinstall the lower splash shield using the 10mm socket and trim clip remover tool.
• Lower the TLX from the jack stands using the floor jack.

Step 12: Evacuate (vacuum) the A/C system

• Connect the manifold gauge set for R-134a (specialty) to the service ports.
• Connect the center hose to the vacuum pump (specialty).
• Run vacuum for 30–45 minutes, then close valves and verify it holds vacuum for 10–15 minutes (this checks for leaks).

Step 13: Recharge by weight

• Charge refrigerant using a refrigerant scale (specialty) so the amount is exact.
• Add the specified refrigerant weight shown on the under-hood A/C label.
• Start the engine, set A/C to MAX, and finish charging per gauge/scale procedure.

---

✅ After Repair

• Check for leaks at the compressor line connections while the A/C is running.
• Verify cold vent temperatures and stable pressures on the manifold gauges.
• Listen for abnormal noises (squeal, grinding, rapid clicking).
• If the old compressor failed internally (metal debris), the correct fix often includes flushing lines and replacing the condenser and receiver/drier to prevent repeat failure.

---

💰 DIY vs Shop Cost

Shop Cost: $1,100-$2,000 (parts + labor)

DIY Cost: $350-$900 (parts only)

You Save: $500-$1,400 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.