🔧 Focus - Rear Window Regulator Replacement

The rear window regulator is the cable-and-track mechanism inside the rear door that raises and lowers the glass. Replacement usually fixes a window that won’t move, moves crooked, or makes grinding/clicking noises.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours (per door)

Quick questions (so I match the parts exactly): Which rear door—left or right? Are you replacing the regulator only or the regulator + motor assembly?

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⚠️ Safety & Precautions

• ⚠️ Support the glass at all times—if it drops, it can shatter or cut you.
• ⚠️ Keep fingers clear of the regulator arms/cables when powered.
• ⚠️ If you unplug the window motor, keep the key out of the ignition so no one hits the switch.
• ⚠️ Wear gloves—door shells have sharp edges.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Trim removal tool set (non-marring)
• Phillips screwdriver
• Flat-blade screwdriver
• 1/4" drive ratchet
• 3/8" drive ratchet
• Extension set (3" and 6")
• 7mm socket
• 8mm socket
• 10mm socket
• Torx T20 bit
• Torx T25 bit
• Torque wrench (in-lb, 20–200 in-lb range)
• Torque wrench (ft-lb, 10–80 ft-lb range)
• Painters tape (2")
• Pick tool
• Needle-nose pliers
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear window regulator - Qty: 1
• Rear window motor - Qty: 1 (only if not included with regulator)
• Door panel trim clip set - Qty: 1 (optional, replace any broken clips)
• Butyl seal strip - Qty: 1 (optional, if the vapor barrier adhesive won’t reseal)

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📋 Before You Begin

• Park your Focus on level ground and open the rear door fully.
• Lower the rear window until you can access the glass-to-regulator clamps (if the window still moves).
• If the window is stuck up or down, you can still do the job—you’ll reposition the glass by hand once the panel is off.
• Trim tool = a plastic pry tool to avoid scratches.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the rear door trim panel

• Use a trim removal tool set (non-marring) to carefully pry up the window switch bezel and unplug the connector.
• Use a pick tool to pop off any small screw covers in the pull handle/armrest area.
• Remove the door panel screws using a 7mm socket and/or Phillips screwdriver (fasteners vary by panel location).
• Work around the outer edge: use the trim removal tool set (non-marring) to pop the push-clips free.
• Lift the panel straight up and off the window ledge, then disconnect any remaining connectors with needle-nose pliers as needed.

Step 2: Remove and preserve the vapor barrier

• Peel back the water shield (vapor barrier) slowly by hand.
• If the adhesive is stubborn, use a flat-blade screwdriver gently to help separate it without tearing.
• Stick it back out of the way so it stays clean for reinstallation.

Step 3: Secure the window glass

• Use painters tape (2") from the outside of the glass over the top of the door frame to hold the glass up.
• Add 2–3 long strips so the glass cannot slide down.

Step 4: Detach the glass from the regulator

• Locate the two glass clamp fasteners through the access holes in the door.
• Use an 8mm socket (common) to loosen the clamp bolts enough to release the glass.
• Once loose, lift the glass fully up by hand and re-tape it securely.
• Torque on reassembly: Torque to 8 Nm (71 in-lb)

Step 5: Unplug the window motor and remove the regulator assembly

• Unplug the motor connector by pressing the tab and pulling straight off (use a pick tool gently if the tab is stiff).
• Remove the regulator mounting bolts using a 10mm socket with a 3/8" drive ratchet and extension set (3" and 6").
• If your replacement is regulator only, remove the motor screws using a Torx T25 bit and transfer the motor to the new regulator.
• Snake the regulator out through the largest door opening (rotate it as needed).
• Torque on reassembly: Torque to 10 Nm (89 in-lb) (regulator-to-door bolts)

Step 6: Install the new regulator (and motor if applicable)

• Feed the new regulator into the door cavity and align it to the mounting holes by hand.
• Start all bolts by hand first, then tighten using a 10mm socket.
• If transferring the motor, install it with a Torx T25 bit and snug evenly (do not overtighten).
• Plug the motor connector back in until it clicks.
• Torque: Torque to 10 Nm (89 in-lb)

Step 7: Reattach the glass to the regulator

• Remove some tape so the glass can slide down in a controlled way.
• Lower the glass by hand into the regulator clamps and ensure it sits evenly left-to-right.
• Tighten the clamp bolts using an 8mm socket.
• Torque: Torque to 8 Nm (71 in-lb)
• Glass crooked now = scratches later.

Step 8: Function test before reassembling the door

• Temporarily plug the window switch back in.
• Turn the key to ON and run the window fully down and fully up.
• Listen for binding or clicking and watch that the glass stays straight in the run channels.
• Turn key OFF and unplug the switch again before reinstalling the panel.

Step 9: Reinstall the vapor barrier and door panel

• Press the vapor barrier back into the butyl adhesive by hand (add butyl seal strip if it won’t stick).
• Hang the door panel on the top lip first, then press the clips in around the perimeter with your hands.
• Reinstall screws using a 7mm socket and/or Phillips screwdriver.
• Snap trim covers back on using the trim removal tool set (non-marring).

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✅ After Repair

• Cycle the rear window 5–10 times to confirm smooth movement and no popping noises.
• Verify the door opens/closes normally and the panel is fully seated (no rattles).
• If the auto-up/one-touch acts odd (if equipped), hold the switch UP for 2 seconds after fully closed, then DOWN for 2 seconds after fully open.

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💰 DIY vs Shop Cost

Shop Cost: $350-$650 (parts + labor)

DIY Cost: $90-$220 (parts only)

You Save: $260-$430 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 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.