🔧 Cherokee - A/C Compressor Replacement

Replacing the A/C compressor on your Cherokee is more than unbolting a part. The refrigerant must be safely recovered, the system must be opened/cleaned correctly, and then it must be vacuumed and recharged to the exact amount so it cools properly and doesn’t damage the new compressor.

This is very DIY-able if you have (or can rent) the right A/C service tools. If the old compressor failed internally, doing the flushing and replacing the drier/desiccant is critical to prevent immediate repeat failure.

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

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⚠️ Safety & Precautions

• ⚠️ Refrigerant is hazardous and must be recovered with proper equipment—do not vent to the air.
• ⚠️ Wear safety glasses and gloves; liquid refrigerant can cause frostbite.
• ⚠️ Let the engine cool before working near the belt and exhaust.
• ⚠️ Keep hands and tools away from rotating parts; the belt drive can start unexpectedly if the engine is running.
• ⚠️ Disconnect the negative battery cable before unplugging the compressor clutch/control connector.

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🔧 Required Tools

You'll need the following tools for this repair:

• R-134a recovery machine (specialty)
• A/C manifold gauge set for R-134a (specialty)
• Vacuum pump (specialty)
• Refrigerant scale (specialty)
• UV leak light (specialty)
• Electronic leak detector (specialty)
• Serpentine belt tool (specialty)
• Socket set 8mm-18mm
• Ratchet
• Torque wrench 10-80 ft-lbs
• Line wrench set
• Trim clip removal tool
• Pick tool set
• Drain pan
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor - Qty: 1
• A/C compressor manifold O-ring set - Qty: 1
• Receiver drier or desiccant bag - Qty: 1
• Expansion valve or orifice tube - Qty: 1
• PAG refrigerant oil (R-134a compatible) - Qty: 1
• R-134a refrigerant - Qty: 2-3 cans
• Serpentine belt - Qty: 1

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📋 Before You Begin

• Have the refrigerant professionally recovered using an R-134a recovery machine (specialty) before you loosen any A/C line.
• Park on level ground, set the parking brake, and place wheel chocks.
• Disconnect the battery: use a socket set 10mm to remove the negative cable and isolate it.
• If your old compressor seized, plan to replace the serpentine belt and inspect the belt tensioner and idlers.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Recover refrigerant (must be empty before opening)

• Connect the A/C manifold gauge set for R-134a (specialty) to the high and low service ports.
• Use the R-134a recovery machine (specialty) to recover the refrigerant completely.
• Verify system pressure is at/near 0 psi on both gauges before proceeding.

Step 2: Gain access to the compressor

• Raise the front of the vehicle with a floor jack (rated 3-ton minimum) and support it with jack stands (rated 3-ton minimum).
• Remove the lower splash shield/undertray using a socket set 8mm-10mm and a trim clip removal tool.
• Position a work light so you can see the compressor and the belt routing clearly.

Step 3: Remove the serpentine belt from the compressor

• Use a serpentine belt tool (specialty) to rotate the belt tensioner and relieve tension.
• Slip the belt off the A/C compressor pulley, then slowly release the tensioner.
• If reusing the belt, take a photo of the belt routing before removal.

Step 4: Disconnect the compressor electrical connector

• Locate the connector on the compressor and release the lock (use a pick tool set if needed).
• Unplug the connector and move the harness safely out of the way.

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

• Place a drain pan under the compressor area to catch any oil.
• Remove the compressor manifold/line retaining bolt(s) using a socket set and ratchet.
• Carefully separate the lines; use a gentle wiggle—do not pry hard on aluminum lines.
• Remove old O-rings with a pick tool set and install new O-rings from the A/C compressor manifold O-ring set.

Step 6: Remove the compressor

• Support the compressor with one hand while removing mounting bolts using a socket set and ratchet.
• Lower the compressor out carefully (it’s heavier than it looks).
• Transfer any brackets if required, using a socket set.

Step 7: Prepare the new compressor (oil balancing)

• Drain and measure oil from the old compressor into a drain pan (note the amount).
• Set the new compressor oil to match system requirements using PAG refrigerant oil (R-134a compatible).
• Slowly rotate the compressor hub by hand a few turns to distribute oil evenly. Prevents dry-start damage.

Step 8: Install the new compressor

• Position the compressor and start all mounting bolts by hand.
• Tighten bolts evenly using a ratchet, then final-tighten with a torque wrench 10-80 ft-lbs to the correct spec for your fasteners.

Step 9: Reconnect A/C lines with new O-rings

• Lightly oil the new O-rings with PAG refrigerant oil (R-134a compatible) before assembly.
• Reinstall the line/manifold and retaining bolt(s) using a socket set and torque wrench 10-80 ft-lbs.
• Do not overtighten A/C fittings—aluminum seals can deform.

Step 10: Reinstall belt and shields

• Route the belt correctly and use the serpentine belt tool (specialty) to release tension and seat the belt fully in all pulley grooves.
• Reinstall the splash shield using a socket set 8mm-10mm and trim clip removal tool.
• Lower the vehicle from the jack stands using the floor jack.

Step 11: Replace receiver/drier or desiccant, and metering device (recommended)

• Replace the receiver drier or desiccant bag to remove moisture from the system (moisture ruins compressors).
• Replace the expansion valve or orifice tube to prevent debris from restricting flow.
• Use line wrench set, socket set, and torque wrench 10-80 ft-lbs as needed for fittings.

Step 12: Evacuate and recharge the A/C system

• Connect the A/C manifold gauge set for R-134a (specialty) and vacuum pump (specialty).
• Pull vacuum and verify it holds (a vacuum that won’t hold indicates a leak).
• Recharge by weight using a refrigerant scale (specialty) with R-134a refrigerant to the exact under-hood label specification.

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✅ After Repair

• Reconnect the battery negative cable using a socket set 10mm.
• Start the engine and turn A/C to MAX; confirm the compressor engages and the air gets cold.
• Check for leaks using an electronic leak detector (specialty) and/or UV leak light (specialty).
• Verify vent temperature and that pressures look normal on the A/C manifold gauge set for R-134a (specialty).

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💰 DIY vs Shop Cost

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

DIY Cost: $450-$1,200 (parts only)

You Save: $700-$1,000 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-6 hours.

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🎯 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.