🔧 Durango - A/C Compressor Replacement

Replacing the A/C compressor on your Durango involves removing the drive belt, disconnecting the refrigerant lines, swapping the compressor, then pulling a deep vacuum and recharging the system. This is done when the compressor seizes, leaks, makes grinding noises, or won’t build pressure.

Difficulty Level: Advanced | Estimated Time: 4-7 hours

Assumption: I’m assuming the refrigerant has already been professionally recovered and I’m using common Pentastar torque specs—verify charge amount/oil type on your under-hood A/C label.

---

⚠️ Safety & Precautions

• ⚠️ Refrigerant is hazardous and recovery is regulated—have a certified shop evacuate the system before you open any A/C line.
• ⚠️ Wear safety glasses and nitrile gloves; liquid refrigerant/oil can cause frostbite and eye injury.
• ⚠️ Work on a cool engine; keep hands clear of the belt path and cooling fans.
• ⚠️ Disconnect the negative battery cable before unplugging the compressor or working near the belt.
• ⚠️ Keep the A/C system “clean”: cap open lines immediately so dirt/moisture can’t get in.

---

🔧 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
• Trim clip removal tool
• Ratchet (3/8")
• Ratchet (1/4")
• Socket set 8mm-18mm
• 10mm socket
• 13mm socket
• 15mm socket
• Torx bit set T20-T40
• Torque wrench 10-150 Nm
• Serpentine belt tool (specialty)
• Pick tool set
• Line caps/plugs assortment (specialty)
• A/C manifold gauge set for R-134a (specialty)
• Vacuum pump (specialty)
• Refrigerant scale (specialty)
• R-134a can tap/adapter (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor (new) - Qty: 1
• A/C compressor manifold O-ring set - Qty: 1
• Receiver/drier desiccant (if serviced separately) or A/C condenser with drier (if required) - Qty: 1
• PAG A/C compressor oil (verify type on under-hood label) - Qty: 1
• R-134a refrigerant (use under-hood label for exact charge) - Qty: As needed
• Optional: Serpentine belt - Qty: 1

---

📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Have the A/C system evacuated by a certified shop before starting.
• Open the hood and disconnect the battery: use a 10mm socket to remove the negative cable and isolate it.
• Raise the front safely: use a floor jack at the front jack point and support with jack stands.
• Tip: Take photos before unplugging anything.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield (for access)

• Use a trim clip removal tool and 8mm socket to remove the fasteners holding the lower splash shield.
• Set the shield and fasteners aside in a tray so nothing gets lost.

Step 2: Relieve belt tension and remove the serpentine belt from the compressor

• Use a 15mm socket with a serpentine belt tool (specialty) on the belt tensioner and rotate to relieve tension.
• Slip the belt off the A/C compressor pulley first, then slowly release the tensioner.
• Tip: Sketch the belt routing before removal.

Step 3: Unplug the compressor electrical connector

• Locate the compressor connector and release the lock tab using a pick tool set (a small hooked tool that helps lift locking tabs without breaking them).
• Pull the connector straight off—do not yank on the wires.

Step 4: Disconnect the refrigerant lines from the compressor

• Confirm the system is empty before opening lines.
• Use a 10mm socket (or the correct socket that fits your fastener) to remove the compressor line/manifold retaining bolt.
• Gently wiggle the line block free; use a pick tool set only if needed.
• Immediately cap the open lines and compressor ports using line caps/plugs assortment (specialty).
• Remove old O-rings with a pick tool set; do not scratch the sealing surfaces.

Step 5: Remove the A/C compressor

• Support the compressor with one hand.
• Use a 13mm socket and ratchet (3/8") to remove the compressor mounting bolts.
• Lower the compressor out carefully (it’s heavier than it looks).

Step 6: Set up the new compressor (oil handling)

• Drain the old compressor oil into a measuring cup by rotating the hub by hand and tipping the unit; note the amount.
• Add the same amount of fresh PAG A/C compressor oil (verify type on under-hood label) to the new compressor.
• Rotate the new compressor hub by hand ~10 turns to distribute oil internally.
• Tip: Too much oil reduces cooling performance.

Step 7: Install the new compressor

• Position the new compressor and start all mounting bolts by hand to avoid cross-threading.
• Use a torque wrench 10-150 Nm with a 13mm socket to tighten compressor bolts: Torque to 45 Nm (33 ft-lbs).

Step 8: Install new O-rings and reconnect the refrigerant lines

• Install new O-rings from the A/C compressor manifold O-ring set.
• Lightly coat O-rings with clean PAG A/C compressor oil (this prevents tearing during assembly).
• Reconnect the line/manifold, then use a torque wrench 10-150 Nm to tighten the retaining bolt: Torque to 12 Nm (106 in-lbs).

Step 9: Reconnect the compressor electrical connector

• Push the connector on until it clicks/locks.

Step 10: Reinstall the serpentine belt

• Route the belt per your under-hood routing diagram.
• Use a 15mm socket with a serpentine belt tool (specialty) to rotate the tensioner and slip the belt over the last pulley.
• Visually confirm the belt is fully seated in every pulley groove.

Step 11: Reinstall the splash shield and lower the vehicle

• Use a trim clip removal tool and 8mm socket to reinstall the lower splash shield fasteners.
• Raise slightly with the floor jack (rated 3-ton minimum), remove jack stands, and lower to the ground.

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

• Connect the A/C manifold gauge set for R-134a (specialty) to the high- and low-side service ports.
• Connect the center hose to the vacuum pump (specialty).
• Open both manifold valves and run the vacuum pump for 30–45 minutes.
• Close both valves, shut off the pump, and verify it holds vacuum for 10–15 minutes (a vacuum drop suggests a leak).

Step 13: Recharge with R-134a by weight

• Place refrigerant on the refrigerant scale (specialty).
• Use the R-134a can tap/adapter (specialty) and charge the exact amount listed on your under-hood A/C label.
• Start the engine and set A/C to MAX, blower HIGH, recirculation ON while finishing the charge per your gauge set procedure.

Step 14: Reconnect the battery

• Use a 10mm socket to reinstall the negative battery cable and tighten securely.

---

✅ After Repair

• Check for leaks at the compressor line connection (look for oily residue and verify pressures are stable on the gauges).
• Verify clutch engagement and that vent temps drop with A/C on.
• Listen for abnormal noises (chirp/grind) and re-check belt alignment.
• If cooling is weak, do not “top off” blindly—recover and recharge by weight per the under-hood label.

---

💰 DIY vs Shop Cost

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

DIY Cost: $350-$900 (parts only, plus any evac/recharge fees)

You Save: $500-$1,200 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.