Difficulty: Moderate | Time: 1–2 hours per side | Tools Required: See below
What Is a Roll-Up Quarter Window Seal?
The roll-up quarter window seal (also called a vertical seal or quarter glass run channel) is the rubber weatherstrip that guides and seals the quarter window glass as it rolls up and down. This is not the same as:
- Fixed Quarter Window Seals — for stationary glass that doesn't move
- Lock Pillar Seals — the U-shaped rubber at the door jamb pillar
If your quarter window glass operates (rolls up/down), this is the correct guide.
Tools & Materials Needed
- 7-Piece Trim & Pry Tool Set (GL-30) — for safe removal of old seals
- 3M Black Weatherstrip Adhesive (GL-11) — for securing ends
- Nitrile Gloves (GL-10)
- Soapy water or silicone-free lubricant
- Clean rags
- Small wire brush
- Channel-lock pliers or vise grips
Step-by-Step Installation
Step 1: Remove the Old Seal
- Roll the window glass completely down.
- Locate the metal channel that holds the vertical seal—typically secured at the bottom with a screw or tab.
- Remove any visible screws. Use vise grips to grip the bottom metal tab.
- Work the tab back and forth gently, then pull firmly downward. The old seal will slide out of the channel.
Tip: On some 1960s–70s GM cars, there's a small pointed retention tip inside the channel near the top (about ¾" down) that holds the seal. Push down firmly from the top to release it.
Step 2: Clean the Channel
- Remove all old rubber residue from the metal channel using your trim tools and a small wire brush.
- Wipe clean with a degreaser or isopropyl alcohol.
- Allow to dry completely.
Step 3: Prepare the New Seal
- Compare the new seal to the old one for length and profile match.
- Apply soapy water or lubricant to the back (the part that slides into the channel).
Pro Tip: Dish soap mixed with water works well for lubrication without harming the rubber.
Step 4: Install the New Seal
- Slide the seal into the channel starting from the bottom.
- Work upward, pressing firmly to seat the rubber fully into the channel.
- Ensure any retention tabs or slots align with the corresponding points in the channel.
- If applicable, secure the bottom screw or clip.
Step 5: Secure the Ends (Optional but Recommended)
Apply a small dot of 3M Black Weatherstrip Adhesive (GL-11) to the top and bottom ends of the seal to prevent future movement.
Step 6: Test Window Operation
- Roll the window up and down several times.
- Check that the glass tracks smoothly without binding.
- Inspect for gaps or misalignment.
What to Expect
Break-In Period: New Metro SUPERsoft rubber is designed slightly thicker than crushed originals. The window may feel tight initially—this is normal. Allow 3–5 days of regular use for the rubber to compress and memorize its shape.
Troubleshooting
| Issue | Solution |
|---|---|
| Seal won't stay in channel | Check for bent channel; apply adhesive at ends |
| Window binds or squeaks | Apply silicone lubricant to glass edges |
| Visible gaps at top/bottom | Re-seat seal; verify correct part number |