What Are Window Run Channels?
Window run channels (also called glass run channels) are the U-shaped rubber strips that guide your window glass as it rolls up and down. They seal against the glass edges to prevent wind noise, water leaks, and rattling.
Do I Need Adhesive?
Most installations: No. Window run channels are typically held in by friction/pressure fit. Simply press them firmly into the window frame channel.
When adhesive IS needed:
- If the original channel was glued in place
- If the run channel won't stay seated in a worn or damaged frame
- For felt-lined channels in certain vintage applications
If adhesive is required, apply small dots of 3M Black Weatherstrip Adhesive (GL-11) to the mounting flange every 4-6 inches.
Installation Steps
Tools Needed:
- 7-Piece Trim & Pry Tool Set (GL-30) for door panel removal
- Plastic paint stick or wooden dowel (to seat rubber without damage)
- Soap/water mixture or silicone spray for lubrication
Step 1: Remove the Door Panel
Use trim tools to remove the inner door panel without damaging clips. On most vehicles, you'll also need to remove the window crank or disconnect power window connections.
Step 2: Remove the Glass (Recommended)
While not always necessary, removing the glass makes installation much easier and prevents accidental damage. Support the glass and disconnect it from the regulator.
Step 3: Remove Old Run Channel
Pull out the old rubber run channel. Note how it was oriented—the soft sealing lip typically faces inward toward the glass.
Step 4: Lubricate the New Channel
Apply a light coat of soapy water or silicone lubricant to the new channel. This helps it slide into position and makes window operation smoother.
Step 5: Install New Run Channel
Starting at one end, press the new channel firmly into the frame:
- Work in sections using a plastic tool to fully seat the rubber
- Ensure the channel follows all curves without kinking
- The sealing lip should face the glass path
Step 6: Test the Window
Reinstall the glass (if removed) and operate the window through several full cycles. The glass should glide smoothly without binding.
Do I Need Felt Lining?
Traditional felt-lined run channels were common on pre-1970s vehicles. Metro's SUPERsoft rubber channels are designed to work without felt for most applications—the rubber provides the cushion and seal. However, if your application specifically calls for felt-lined channels, ensure you're ordering that specific part number.
Pro Tips
- Never force the glass. If the window binds, the channel isn't seated correctly.
- Work in warm temperatures. Cold rubber is stiff and harder to seat properly.
- New channels may feel tight initially—they will break in after a few weeks of use.