🔧 Veloster - A/C Compressor Replacement

Replacing the A/C compressor fixes issues like grinding noise, seized pulley, no cold air, or metal contamination in the system. This job is part mechanical (remove/replace) and part A/C service (evacuate and recharge) to protect the system and compressor.

Difficulty Level: Advanced | Estimated Time: 3-6 hours (plus A/C evac/recharge time)

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⚠️ Safety & Precautions

• ⚠️ Do not vent refrigerant to the air; have the system professionally recovered first.
• ⚠️ Wear safety glasses and gloves; liquid refrigerant can cause frostbite.
• ⚠️ Keep fingers/tools clear of the belt path.
• ⚠️ Support the A/C lines; do not bend or twist them.
• ⚠️ Disconnect the negative battery terminal before unplugging compressor wiring.

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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
• Metric socket set (8mm-19mm)
• 3/8" drive ratchet
• 3/8" drive torque wrench
• Extensions set (3" and 6")
• Metric combination wrench set (10mm-17mm)
• Flat trim clip tool
• Phillips screwdriver
• Serpentine belt tool (specialty)
• Drain pan
• Shop rags
• A/C manifold gauge set for R-134a (specialty)
• Vacuum pump (specialty)
• Refrigerant scale (specialty)
• Refrigerant leak detector (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• A/C compressor - Qty: 1
• A/C compressor O-ring kit (HNBR green O-rings) - Qty: 1
• PAG refrigerant oil (Hyundai-compatible) - Qty: 1
• R-134a refrigerant - Qty: 1 system charge
• Serpentine belt - Qty: 1

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📋 Before You Begin

• Park on level ground, chock the rear wheels, and let the engine cool.
• Have an A/C shop recover the refrigerant before you loosen any A/C lines.
• Disconnect the negative battery terminal using a 10mm socket.
• Plan to replace every opened O-ring.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and support the front of the car

• Place wheel chocks behind the rear wheels.
• Lift the front using a floor jack (rated 3-ton minimum) at the proper jacking point.
• Set the car on jack stands (rated 3-ton minimum) and gently shake-test stability.

Step 2: Remove the lower splash shield (undertray)

• Remove clips and screws using a flat trim clip tool and Phillips screwdriver.
• Set all fasteners aside in a tray so you don’t lose them.

Step 3: Relieve belt tension and remove the drive belt

• Use a serpentine belt tool (specialty) to rotate the belt tensioner and create slack.
• Slip the belt off the A/C compressor pulley first, then remove it fully.
• Serpentine belt tool = long handled wrench for tight spaces.

Step 4: Unplug the compressor electrical connector

• Locate the compressor connector and press the lock tab.
• Disconnect it by hand; use a flat trim clip tool only if it’s stuck (don’t break the tab).

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

• Place a drain pan under the compressor and lay shop rags below the fittings.
• Remove the line retaining bolt(s) using a metric socket set (8mm-19mm) and 3/8" drive ratchet.
• Gently wiggle the manifold/lines free; do not pry hard or bend the aluminum lines.
• Immediately remove and discard the old O-rings; keep ports clean with a rag.
• Torque to OEM spec (refer to factory service information) when reinstalling line retaining bolt(s).

Step 6: Remove the compressor mounting bolts and compressor

• Support the compressor with one hand while removing bolts with a metric socket set (8mm-19mm), extensions set (3" and 6"), and 3/8" drive ratchet.
• Remove the compressor from below.
• Torque to OEM spec (refer to factory service information) for compressor mounting bolts during installation.

Step 7: Prepare the new compressor (oil balancing)

• Rotate the compressor hub by hand a few turns to feel for smooth movement.
• Check the new compressor oil quantity per the compressor instructions.
• Drain and measure oil from the old compressor into a drain pan, then match that amount into the new compressor using the supplied oil or PAG refrigerant oil.
• Too much oil can reduce cooling.

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

• Install new O-rings from the A/C compressor O-ring kit on the line ends.
• Lightly coat O-rings with clean PAG refrigerant oil so they don’t tear.
• Reattach the lines and tighten the retaining bolt(s) using a 3/8" drive torque wrench.
• Torque to OEM spec (refer to factory service information).

Step 9: Install the compressor and reconnect wiring

• Position the compressor and hand-start all mounting bolts to prevent cross-threading.
• Tighten bolts evenly using a 3/8" drive torque wrench.
• Torque to OEM spec (refer to factory service information).
• Reconnect the electrical connector until it clicks.

Step 10: Reinstall the belt and undertray

• Route the belt correctly and use the serpentine belt tool (specialty) to release tension.
• Reinstall the undertray with the Phillips screwdriver and flat trim clip tool.

Step 11: Evacuate the system (vacuum) and recharge with R-134a

• Connect the A/C manifold gauge set for R-134a (specialty) to the low and high service ports.
• Connect the vacuum pump (specialty) and pull vacuum (deep vacuum) long enough to boil out moisture.
• Close valves and verify vacuum holds (no loss). If it won’t hold, you have a leak that must be fixed before charging.
• Charge by weight using R-134a refrigerant and a refrigerant scale (specialty).
• Charge to OEM under-hood label specification (exact ounces/grams).

Step 12: Leak-check

• With the engine running and A/C on MAX, check fittings using a refrigerant leak detector (specialty).
• Visually inspect for oil residue around the compressor and line connections using safety glasses.

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✅ After Repair

• Reconnect the battery negative terminal using a 10mm socket.
• Start the engine and turn A/C to MAX; confirm the compressor engages and cold air returns.
• Listen for belt squeal or rubbing; shut down immediately if you hear it.
• Recheck for leaks after a short drive.

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,800 (parts + labor + evac/recharge)

DIY Cost: $350-$900 (parts only, assuming you already have A/C service tools)

You Save: $550-$900 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?

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.