Q: I have an older car, and do not have keyless entry. My driver’s door lock is getting harder and harder to work with the key. Do I need to replace it, or can I do something to make it work better?
A: There are two elements to the door’s locking mechanism: 1) the keyed tumbler system and 2) the actual mechanism that is engaged when the tumblers are engaged/disengaged. Your problem is most likely with the first. To fix it, blow compressed air (or use a can of air with the nozzle attached) into the slot where your key goes. This will dislodge and remove any debris. Now, stick the end of a tube of powdered graphite into the key slot and squeeze a puff or two into the lock. Now, insert the key and slide it in and out a few times – then turn the key several times to get the graphite throughout the lock. This service should be performed about every 6-months to a year, depending on how dirty your area is. If you need to fix the interior mechanism, you’ll need to remove the inside door panel and clean and lubricate as necessary for your specific locking mechanism. White lithium grease is excellent as a lubricant for this application.
