🔧 Murano - A/C Compressor Replacement

Replacing the A/C compressor on your Murano involves safely removing refrigerant, removing the drive belt, swapping the compressor, and then vacuuming and recharging the system. This job can go wrong fast if refrigerant is vented or moisture gets into the system, so the recover/vacuum/recharge steps matter as much as the bolt-turning.

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

Assumption: Your Murano uses R-134a; verify on the under-hood A/C label.

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⚠️ Safety & Precautions

• ⚠️ Refrigerant must be recovered properly; do not vent to air (illegal and dangerous).
• ⚠️ Wear eye protection and gloves; liquid refrigerant can cause frostbite instantly.
• ⚠️ Keep dirt/moisture out of open A/C lines; cap lines immediately after opening.
• ⚠️ Disconnect the negative battery cable before unplugging the compressor connector.
• ⚠️ Never run the compressor with low/no refrigerant; it can seize and contaminate the system.

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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
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" drive ratchet
• 3/8" drive torque wrench (10–100 Nm range)
• 3/8" drive breaker bar
• Serpentine belt tool (specialty)
• Trim clip remover
• Flat-blade screwdriver
• Line caps/plugs assortment
• Clean drain pan
• Measuring cup (graduated in mL or oz)
• A/C manifold gauge set for R-134a (specialty)
• Vacuum pump (specialty)
• Refrigerant recovery machine (specialty)
• Electronic refrigerant scale (specialty)
• UV leak flashlight (365–395 nm)

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🔩 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
• R-134a refrigerant - Qty: 1 charge (per under-hood label)
• A/C compressor oil (PAG oil, type per under-hood label/service info) - Qty: as needed to match oil balance
• Serpentine drive belt - Qty: 1 (recommended if worn or oil-soaked)

• 🧩 If the old compressor failed loudly, seized, or you see metallic debris in the oil, also plan on:
• A/C condenser (receiver/drier is typically integrated) - Qty: 1
• Expansion valve - Qty: 1
• A/C system flush solvent (A/C-approved) - Qty: as needed

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Have the refrigerant professionally recovered, or use a refrigerant recovery machine (this machine pulls refrigerant into a storage tank).
• Let the engine cool fully; you’ll be working near the radiator fans and belt drive.
• Disconnect the battery: use a 10mm socket to remove the negative terminal and isolate it so it can’t spring back.
• Plan to cap every open A/C line immediately using line caps/plugs.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Recover the refrigerant (required)

• Connect your A/C manifold gauge set for R-134a (specialty) to the high- and low-side service ports.
• Use the refrigerant recovery machine (specialty) to recover the refrigerant completely per the machine instructions.
• Never crack lines open “to bleed it off.”

Step 2: Raise the front of the vehicle and remove splash shields

• Use a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum) at the proper lift points.
• Remove lower engine cover/splash shield fasteners using a 10mm socket and trim clip remover.
• Remove any additional small fasteners with a flat-blade screwdriver as needed.

Step 3: Remove the serpentine belt from the A/C compressor

• Use a serpentine belt tool (specialty) (a long handled wrench made to rotate the belt tensioner safely).
• Rotate the tensioner to relieve belt tension, then slip the belt off the A/C compressor pulley.
• Take a photo of belt routing first.

Step 4: Unplug the compressor electrical connector

• Locate the compressor connector and release the lock tab using a flat-blade screwdriver if needed.
• Pull the connector straight off; do not yank on the wiring.

Step 5: Remove the refrigerant lines from the compressor

• Place a clean drain pan underneath to catch any oil.
• Remove the A/C line flange bolts using a 10mm socket.
• Gently wiggle the lines free; cap both the lines and compressor ports immediately using line caps/plugs assortment.
• Torque on reassembly (line flange bolts): 9.8 Nm (87 in-lb)

Step 6: Remove the A/C compressor mounting bolts and remove the compressor

• Support the compressor by hand.
• Remove the compressor mounting bolts using a 12mm socket and 3/8" drive ratchet.
• Lower and remove the compressor from underneath.
• Torque on reassembly (compressor mounting bolts): 25 Nm (18 ft-lb)

Step 7: Transfer oil amount correctly (very important)

• Drain the old compressor oil into a measuring cup (graduated in mL or oz).
• Drain the new compressor into the measuring cup too (many new compressors ship with oil).
• Add or remove oil so the new compressor ends up with the correct oil balance for your Murano’s system (oil type/amount depends on the A/C label/service info).
• Too much oil can reduce cooling.

Step 8: Install new O-rings and reinstall the lines

• Remove and discard the old O-rings from the A/C line ends.
• Install new O-rings from the A/C compressor O-ring set.
• Lightly coat O-rings with clean A/C compressor oil (PAG oil, type per under-hood label/service info) so they don’t tear.
• Reconnect the lines and tighten flange bolts using a 10mm socket and finish with a 3/8" drive torque wrench (10–100 Nm range).
• Torque: 9.8 Nm (87 in-lb)

Step 9: Reinstall the compressor and belt

• Position the compressor and hand-start the mounting bolts to avoid cross-threading.
• Tighten with a 12mm socket and torque with a 3/8" drive torque wrench (10–100 Nm range).
• Torque: 25 Nm (18 ft-lb)
• Reinstall the serpentine belt using the serpentine belt tool (specialty).

Step 10: Reassemble covers and reconnect the battery

• Reinstall the splash shields using a 10mm socket and trim clip remover.
• Reconnect the negative battery terminal using a 10mm socket.

Step 11: Vacuum the system (remove air and moisture)

• Connect the A/C manifold gauge set for R-134a (specialty).
• Connect the vacuum pump (specialty) to the manifold center hose.
• Pull vacuum until stable (commonly 30–45 minutes), then close valves and verify it holds vacuum (no rise) for ~10–15 minutes.
• Vacuum holds = no major leaks.

Step 12: Recharge by weight (not by pressure)

• Place the refrigerant on an electronic refrigerant scale (specialty).
• Charge the exact amount listed on the under-hood A/C label using the A/C manifold gauge set for R-134a (specialty).
• Start the engine, turn A/C to MAX, and complete charging procedure per equipment instructions.

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✅ After Repair

• Verify cold air at the vents and that the A/C compressor clutch/control engages normally.
• Check for leaks at the compressor and line connections using a UV leak flashlight (365–395 nm) if dye is present, or watch for oily residue.
• Listen for abnormal noises (grinding/whining). Shut it off immediately if heard.
• Recheck the belt routing visually with the engine off.

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💰 DIY vs Shop Cost

Shop Cost: $1,200-$2,200 (parts + labor + recover/recharge)

DIY Cost: $350-$1,100 (parts only, assuming you already have A/C service equipment)

You Save: $850-$1,100 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?

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