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Step 9. Sometimes the lock bar won’t lock the door because it won’t slide into its opening on the door track. To fix this, loosen the guide bracket that holds the lock bar and move it up or down until the bar hits the opening.

Step 10. Worn or broken weather-stripping on the bottom edge of the door can let in a lot of cold air and stiff breezes. Check to see if this strip is cracked, broken, or has holes along its edges. If so, remove the old strip and pull any nails left behind.

Step 11. Measure the width of your garage door, then buy a piece of weather-stripping to match. These strips are standard lumber yard and home center items. Sometimes they are sold in kit form, with fasteners included. If not, just nail the strip ping in place with galvanized roofing nails.

Step 12. If the chain on your garage door opener is sagging more than 1/2 below the bottom rail, it can make a lot of noise and cause drive sprocket wear. Tighten the chain according to the directions in the owner’s manual.