🔧 Forester - A/C Compressor Replacement

Replacing the A/C compressor on your Forester involves safely recovering the refrigerant, removing the drive belt and A/C lines, swapping the compressor, then evacuating and recharging the system to the exact factory specification. Because the A/C system is a sealed, high-pressure refrigerant system, a couple details determine the correct parts list and the exact recharge procedure.

Difficulty Level: Advanced | Estimated Time: 4-6 hours (plus evacuate/recharge time)

---

⚠️ Safety & Precautions

• ⚠️ Refrigerant must be recovered with proper equipment; do not vent refrigerant to the atmosphere.
• ⚠️ Wear safety glasses and gloves; liquid refrigerant can cause frostbite and eye injury.
• ⚠️ Keep hands/tools clear of the belt drive; never work near rotating pulleys with the engine running.
• ⚠️ Do not allow dirt into open A/C lines; cap/plug lines immediately.
• ⚠️ Battery disconnect is recommended before unplugging the compressor clutch/control connector.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Metric socket set (8mm-19mm)
• 3/8" drive ratchet
• 3/8" drive torque wrench (10-100 Nm range)
• Extensions (3" and 6")
• Metric combination wrench set (10mm-19mm)
• Serpentine belt tool (specialty)
• Trim clip removal tool
• Flathead screwdriver
• Line caps/plugs assortment (A/C line caps)
• A/C manifold gauge set (R-134a or R-1234yf compatible as required)
• Vacuum pump (A/C) (specialty)
• Refrigerant recovery machine (specialty)
• Refrigerant scale (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor (correct for your Forester) - Qty: 1
• A/C compressor O-ring set (HNBR green O-rings) - Qty: 1
• A/C refrigerant (type and charge per under-hood label) - Qty: As required
• A/C compressor oil (type/amount per Subaru procedure) - Qty: As required
• Accessory drive belt - Qty: 1 (recommended if belt is worn/cracked)
• Condenser/receiver-drier assembly - Qty: 1 (required if compressor failed and spread metal)
• Expansion valve - Qty: 1 (recommended if compressor failed and spread debris)

---

📋 Before You Begin

• Park on level ground, set the parking brake, and use wheel chocks.
• Have an A/C shop recover the refrigerant first, or use a certified recovery machine.
• Disconnect the negative battery terminal using a 10mm socket.
• Clean the area around A/C line fittings before opening them to keep dirt out.
• Two quick questions so I give you the exact Subaru-correct steps, torque specs, and recharge spec:
  • 1) What does the under-hood A/C label list for refrigerant type and charge amount? (A clear photo is perfect.)
  • 2) Did the old compressor seize/make grinding noise or did it fail quietly (like a leak or weak cooling)?

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Recover the refrigerant (required)

• Use a refrigerant recovery machine (specialty) to fully recover the A/C system.
• If you don’t have recovery equipment, have a shop perform recovery and return the vehicle with the system empty.

Step 2: Raise the vehicle and access the compressor

• Lift the front using a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove the lower engine cover/splash shield using a trim clip removal tool and metric socket set (8mm-19mm).

Step 3: Remove the accessory drive belt

• Relieve belt tension using a serpentine belt tool (specialty).
• Slip the belt off the compressor pulley and move it out of the way.
• Take a quick belt-routing photo first.

Step 4: Disconnect electrical connector(s)

• Unplug the compressor connector by hand; use a flathead screwdriver only if needed to release the lock tab.

Step 5: Remove the A/C lines from the compressor (cap immediately)

• Remove the line retaining bolt(s) using a metric socket set (8mm-19mm) and 3/8" drive ratchet.
• Pull the lines straight out (do not pry on the aluminum tubes).
• Immediately cap the open lines and compressor ports using line caps/plugs assortment (A/C line caps).

Step 6: Remove the compressor from its bracket

• Remove the compressor mounting bolts using a metric socket set (8mm-19mm), extensions (3" and 6"), and a 3/8" drive ratchet.
• Lower the compressor out carefully; it’s heavier than it looks.

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

• Replace all disturbed O-rings using the A/C compressor O-ring set (HNBR green O-rings).
• Lubricate new O-rings with the correct A/C compressor oil before installation.
• Set compressor oil amount per Subaru procedure (this depends on what failed and what parts you replace).

Step 8: Install the new compressor

• Position the compressor and hand-start all mounting bolts using your fingers first (prevents cross-threading).
• Tighten using a 3/8" drive torque wrench (10-100 Nm range) to the Subaru torque specification.

Step 9: Reconnect A/C lines and electrical

• Install the A/C lines squarely into the ports with new O-rings.
• Tighten line retaining bolt(s) using a 3/8" drive torque wrench (10-100 Nm range) to the Subaru torque specification.
• Reconnect the compressor electrical connector by hand until it clicks.

Step 10: Reinstall belt and covers

• Reinstall the belt using a serpentine belt tool (specialty) and confirm it is fully seated in every pulley groove.
• Reinstall the splash shield using a trim clip removal tool and metric socket set (8mm-19mm).
• Lower the vehicle using a floor jack (rated 3-ton minimum).

Step 11: Evacuate and recharge the A/C system by weight

• Connect an A/C manifold gauge set and pull vacuum with a vacuum pump (A/C) (specialty).
• Verify the system holds vacuum (leak check).
• Recharge using a refrigerant scale (specialty) to the exact under-hood label weight.

---

✅ After Repair

• Start the engine and turn A/C on Max; verify the compressor engages and air gets cold.
• Check for leaks at the compressor ports and line connections using the A/C manifold gauge set.
• Listen for abnormal noises and recheck belt alignment.

---

💰 DIY vs Shop Cost

Shop Cost: $900-$1,800 (parts + labor, more if system contamination)

DIY Cost: $250-$900 (parts only, varies by what else must be replaced)

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.