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How to Repair a Car Window Leak

Updated April 17, 2017

Window leaks can cost you a lot of money if you hire a repairman. If you have noticed that the floorboards, car dash or seats are wet after driving your car under heavy rain, it is possible that you have a car window leak. Another sign that you have this problem is the detection of mildew-like or musty odour coming from the inside of your car after it gets wet. If it is just a minor leak, you can fix your car window on your own.

Sit in your car's rear seat and have someone spray water on your vehicle using your garden hose. This will allow you to detect the leaking window. Watch the side windows as well as your windshield to find where leak is coming from.

Remove the window edge's trim. Find the seam of your trim, which is normally located at the bottom of your side windows or at the windshield's top corners. Pull this trim out from your window slowly to pop it out of the window edge.

Inspect your window edges for missing caulking or any mildewed spots. Look at the edges for any chips or cracks in the glass.

Add new caulking in case the window caulk is already damaged or missing. Remove your window's old caulking by gradually trimming it away using your utility knife.

Clean the area thoroughly using rubbing alcohol and dry cloth to fully remove the leftover debris. Do not let your alcohol drip onto your good caulking.

Replace your caulk with your polyurethane sealant with a caulking gun.

Apply silicone rubber on the cracks on your window edges. This will help stop the leaks from any minor flaws and cover these up once the trim is back in place.

Press your trim back in its place around the window edges.

Things You'll Need

  • Garden hose
  • Utility knife
  • Rubbing alcohol
  • Dry cloth
  • Polyurethane sealant
  • Caulking gun
  • Silicone rubber
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About the Author

Based in West Windsor, New Jersey, Kelly Brown has been writing health and travel related articles since 1999. Her work has appeared in “Salon” magazine and “Better Health” magazine. Brown holds a Bachelor of Arts in English from the Southern Connecticut State University.