How do I fix leaking convertible door seals on a Chevrolet Corvette C5?

If your convertible top seals don't look visibly rotted or torn, you likely don't need to replace them. The most common fix for C5 window leaks—especially where the top and windshield seals meet—is performing a window tip-in adjustment ¹.

This adjustment changes the angle of the window regulator track inside the door, forcing the top edge of the glass tighter against the weatherstripping ³.

Here is how to tackle this:

1. The Window Tip-In Adjustment (Difficulty: Moderate)

You'll need to pull the interior door panels to access the regulator.

• Locate the Adjuster: The tip-in adjuster is located at the bottom of the window regulator track, toward the front of the door ³.
• Adjust the Angle: Adjusting this mount will pitch the top of the glass inward toward the center of the car. Make small adjustments, as going too far can create other alignment issues with the window track ³.
• Test the Fit: Close the door and roll the window up. You can test the seal pressure using the "dollar bill trick"—if the window is adjusted correctly, you should not be able to easily slide a dollar bill front-to-back between the glass and the rubber seal ¹.

Note: If you damage the blackish-grey rubber inner door seal (water deflector) while removing the door panel, you can still find replacements online. The GM part numbers are 10263411 for the driver (LH) side and 10263412 for the passenger (RH) side ⁵.

2. Check the Wiper Cowl "Udders"

If you are getting water dripping onto your feet in the footwell, you might be misdiagnosing the door seals. The C5 is notorious for plugged drain "udders" in the wiper wells.

• When these rubber drains clog with debris, water backs up and leaks into the cabin through the firewall ².
• While you're in the wiper compartment, check the grommet where the hood latch cable passes through the firewall. If it's pushed in, water will pour through. You can fix this by sealing the grommet with silicone sealant and a coat of rubber undercoating ².

If you get into the door and find the tip-in adjustment too finicky to get right, a local auto glass shop (like Safelite) can usually dial in the window alignment quickly and for relatively cheap ¹.