1999 INFINITI G20 Side Window Glass: A Buyer's and DIY Guide

Symptoms of Side Window Glass Failure

Side window glass failure is almost always the result of physical damage. However, problems with related components can sometimes be mistaken for a glass issue. Here’s what to look for:

• Visible Cracks or Chips: Any impact from road debris, an accident, or a break-in can cause cracks or chips. Even a small chip can spread over time, eventually leading to a full break.
• Shattered Glass: The most obvious sign of failure is a completely shattered window. Because it's tempered glass, it will break into many small, cube-like fragments.
• Scratches: Deep scratches can obstruct vision and weaken the glass, making it more susceptible to breaking under stress.
• Window is Off-Track or Crooked: If the window appears tilted in its channel as it moves up or down, this often points to a problem with the window regulator, not the glass itself. The clips that hold the glass to the regulator may be broken.
• Grinding or Clicking Noises: Sounds heard when trying to operate the window are classic symptoms of a failing window regulator or motor, which can cause the glass to jam or fall into the door.

Buying a Used Side Window Glass for a 1999 INFINITI G20

Since new OEM and aftermarket side glass for the 1999 G20 are largely unavailable, the used market is your primary source. A recycled OEM part is an excellent choice, as it preserves the original fit and quality. Here’s a detailed checklist for inspecting a used side window before you buy:

1. Verify Compatibility

Side window glass is not interchangeable. Each piece is specific to its location on the vehicle. Ensure the glass you are buying is for the correct door:

• Driver Side Front (Left Front)
• Passenger Side Front (Right Front)
• Driver Side Rear (Left Rear)
• Passenger Side Rear (Right Rear)

Part numbers will be different for each position. For example, the passenger front door glass may be part number 80300-3J103, while the driver's rear could be 82301-3J103. Always confirm the position with the seller.

2. Physical Inspection Checklist

Carefully examine the entire piece of glass. It's best to do this in good light.

• Check for the OEM Logo: Look for the Infiniti or Nissan logo etched into a corner of the glass. This confirms it is a genuine OEM part that meets factory quality standards, not a lower-quality aftermarket piece.
• Inspect for Scratches: Run your fingers over the surface to feel for any deep scratches or irregularities you might not see at first glance. Minor surface scuffs are common on used parts, but deep scratches can compromise visibility and structural integrity.
• Look for Chips and Cracks: Pay close attention to the edges and corners, as this is where damage often starts. Even a tiny chip near the edge can spread once the glass is installed and under stress. Reject any glass with existing cracks or chips.
• Check for Distortion: Look through the glass from various angles to spot any waviness or visual distortion, which can be a sign of a low-quality aftermarket part.
• Examine Mounting Points: Check the areas where the glass attaches to the window regulator. Ensure there are no chips or cracks around these mounting holes, as this is a high-stress area.

Known Issues, Recalls, and TSBs

There are no recalls or common Technical Service Bulletins (TSBs) issued by the NHTSA specifically related to the side window glass for the 1999 INFINITI G20. Any failures are typically due to external factors like impact or issues with the window regulator, which is a common failure point on many vehicles as they age.

Replacement Overview and Difficulty

Replacing the side window glass on a 1999 G20 is a manageable DIY project for someone with basic mechanical skills. The most challenging part is removing the interior door panel without damaging the clips.

• Difficulty: 3 out of 5
• Estimated Time: 1.5 - 2 hours
• Tools Needed: Phillips screwdriver, flathead screwdriver, door panel removal tool, socket set.

General Replacement Steps:

1. Remove the Door Panel: This typically involves removing screws located in the armrest and door handle area, then using a panel removal tool to carefully pry the panel away from the door to release the plastic clips.
2. Disconnect Electronics: Unplug any electrical connectors for the window switch, power locks, and speakers.
3. Peel Back the Vapor Barrier: Carefully peel back the plastic or foam sheet that protects the inside of the door from moisture.
4. Access the Glass: Lower the window regulator (if possible) to align the glass mounting bolts with the access holes in the door's inner structure.
5. Unbolt the Old Glass: Remove the bolts that secure the glass to the window regulator. Carefully lift the old glass (or what's left of it) out through the top of the door frame.
6. Install the New Glass: Carefully lower the replacement glass into the door and secure it to the regulator. Do not overtighten the bolts.
7. Test and Reassemble: Reconnect the window switch and test the operation before reinstalling the vapor barrier and door panel.

Cost Comparison for 1999 INFINITI G20 Side Window Glass

Because of the vehicle's age, new parts are generally not available. The most common and cost-effective solution is a used OEM part from a salvage yard or online recycler.