A few months ago my driver side door lock stopped working, key goes in easily but simply won't turn, as if I'm using the wrong key. Then a couple of weeks ago my trunk lock stopped working as well and unfortunately it's the only way to open the trunk. Thinking that it might be the key itself, however it does open the passenger side lock and the ignition switch, I reluctantly had a key cut for it. $40.00CDN later and a brand new laser cut key and the exact same thing.
I tried lubing the inside with heavy weight oil, nothing. I thought perhaps there could be something gummy inside (WD-40 or lock de-icer) so I heated the key up with a blow torch and stuck in the slot for about 30 seconds, did this about 6-7 times while trying to turn the key, and still nothing. Tried using gun wash fluid, which is pretty strong stuff, and again nothing. Thinking the tumblers maybe stuck, blew some compressed air (80 p.s.i.) inside to perhaps loosen things up a bit and then lubed it with some white lithium grease. I was able to lock the driver side but couldn't unlock it, I was able to lock it for a few weeks then it got stuck again.
Does anybody have any other suggestions that might work?
Thanks in advance, Norbert