🔧 Forester - Rear Window Regulator Replacement

A rear window regulator is the cable-and-track assembly that moves the glass up and down. When it fails, the window may move slowly, tilt, bind, or drop into the door. This job involves removing the rear door trim panel, securing the glass, swapping the regulator assembly, then reassembling and testing.

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

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⚠️ Safety & Precautions

• ⚠️ Keep fingers clear of the regulator and tracks; pinch risk is serious.
• ⚠️ Support the glass at all times once it’s unclamped; it can drop suddenly.
• ⚠️ Disconnect the battery negative terminal to prevent accidental window movement and avoid shorting connectors.
• ⚠️ Do not tear the vapor barrier (plastic sheet); it prevents water leaks into the cabin.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 10mm ratchet
• 6-inch extension (1/4-inch drive)
• Phillips #2 screwdriver
• Flat trim clip removal tool
• Plastic trim removal tool set
• Needle-nose pliers
• Torque wrench (inch-pound capable)
• Painter’s tape (1-inch wide)
• Work gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear window regulator assembly (left or right) - Qty: 1
• Rear window regulator motor - Qty: 1 (only if not included)
• Rear door panel clips - Qty: 4-10 (as needed)
• Butyl tape (vapor barrier adhesive) - Qty: 1 (as needed)

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📋 Before You Begin

• Park on level ground, shift to Park, and turn the ignition off.
• Lower the affected rear window to about halfway if it still moves (this lines up the glass clamp bolts with the access holes).
• Disconnect the battery using a 10mm socket (remove negative terminal and isolate it).
• Trim tools prevent scratches and broken clips. A trim removal tool is a plastic pry tool used to pop panels without damaging them.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the rear door switch panel

• Use a plastic trim removal tool set to gently pry up the rear window switch bezel.
• Unplug the switch connector by pressing the lock tab (use needle-nose pliers gently if needed).

Step 2: Remove rear door trim panel screws

• Remove the screw behind the interior door handle using a Phillips #2 screwdriver.
• Remove any additional visible screws in the armrest/pull handle area using a Phillips #2 screwdriver.

Step 3: Pop off the rear door trim panel (door card)

• Use a flat trim clip removal tool to pop the clips around the sides and bottom of the panel.
• Lift the panel straight upward to unhook it from the window ledge.
• Disconnect any remaining connectors (courtesy light/speaker if equipped) by hand or with a plastic trim removal tool set.

Step 4: Peel back the vapor barrier carefully

• Carefully peel the plastic vapor barrier back just enough to access the regulator area.
• If the adhesive is stubborn, use a plastic trim removal tool set to separate it without tearing.
• Stick it to itself to keep it clean.

Step 5: Secure the glass so it can’t fall

• Locate the access holes in the door metal and find the two glass clamp bolts.
• If the window is stuck too high/low to access the bolts, you may need to temporarily reconnect the switch and battery to move it, then disconnect again before continuing.
• Run several long strips of painter’s tape (1-inch wide) from the outside of the glass, over the top of the door frame, and down the inside to “hang” the glass in place.

Step 6: Unclamp the glass from the regulator

• Use a 10mm socket with a 10mm ratchet and 6-inch extension (1/4-inch drive) to loosen/remove the two glass clamp bolts through the access holes.
• Carefully push the glass upward by hand until it is fully up, then add more painter’s tape (1-inch wide) to secure it.
• Torque to 7.5 Nm (66 in-lbs) on reassembly (glass clamp bolts).

Step 7: Disconnect the regulator motor electrical connector

• Unplug the regulator motor connector by pressing the tab (use needle-nose pliers gently if needed).

Step 8: Remove the regulator assembly

• Remove the regulator mounting bolts using a 10mm socket and 10mm ratchet.
• If your replacement regulator does not include the motor, remove the motor screws/bolts from the old regulator using a 10mm socket (or Phillips #2 screwdriver if equipped).
• Work the regulator out through the largest access opening, rotating it as needed.
• Torque to 7.5 Nm (66 in-lbs) on reassembly (regulator mounting bolts).

Step 9: Install the new regulator (and motor if needed)

• Guide the new regulator into the door and align it to the mounting holes by hand first.
• Start all bolts by hand (prevents cross-threading), then tighten using a 10mm socket and 10mm ratchet.
• If transferring the motor, install it onto the new regulator and tighten with a 10mm socket (or Phillips #2 screwdriver as equipped).
• Torque to 6 Nm (53 in-lbs) on reassembly (motor fasteners, if equipped).

Step 10: Reattach the glass to the regulator

• Reconnect the regulator motor connector by hand until it clicks.
• Reconnect the battery negative temporarily using a 10mm socket, plug the switch in, and turn ignition ON to move the regulator to align with the glass clamps (then ignition OFF and disconnect battery again before tightening).
• Lower the glass carefully into the clamps, ensuring it sits evenly (not tilted).
• Tighten the glass clamp bolts using a 10mm socket, 10mm ratchet, and 6-inch extension (1/4-inch drive).
• Torque to 7.5 Nm (66 in-lbs) (glass clamp bolts).

Step 11: Function test before reassembly

• Reconnect the battery negative using a 10mm socket.
• Turn ignition ON and run the window fully down and fully up using the switch.
• Listen for clicking/grinding and watch for the glass tilting; if it tilts, loosen clamps with a 10mm socket and re-seat the glass evenly.
• Remove all painter’s tape (1-inch wide) after successful testing.

Step 12: Reinstall the vapor barrier and door trim panel

• Press the vapor barrier back into place by hand; use butyl tape if the adhesive no longer sticks.
• Reconnect all door panel connectors by hand until they click.
• Hang the door panel on the upper window ledge, then press clips in around the edges (use palms; don’t punch).
• Reinstall screws using a Phillips #2 screwdriver.
• Reinstall the switch bezel using a plastic trim removal tool set to press it in evenly.

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✅ After Repair

• Cycle the rear window 5 times and confirm smooth travel and proper sealing at the top.
• If the affected rear window has “auto” function and it acts weird, initialize it: with ignition ON, hold the switch in the UP position for 3 seconds after it fully closes, then hold DOWN for 3 seconds after it fully opens.
• Check that the door opens/closes normally and the panel is not rattling (replace broken clips if needed).
• After the next rain or car wash, check the rear footwell for moisture (vapor barrier seal check).

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💰 DIY vs Shop Cost

Shop Cost: $350-$750 (parts + labor, per rear door)

DIY Cost: $90-$260 (parts only, per rear door)

You Save: $260-$490 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 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.

Assumption: Rear door fasteners are typically 10mm/Phillips on your Forester; if a fastener differs, match the socket/bit to the head to avoid stripping.