I have mk4 VW Golf from 2002 and this winter the trunk's lock has gotten frozen twice and I can't open the trunk. It's not like other winters that the door gets frozen. This year is been the lock itself and I don't even can introduce the key on it when it happens.
Bear in mind that I live in Finland, so we are talking that sometimes the temps go down to -15ºC or more, and even can reach -33ºC. However, other years those temps haven't been an issue.
To fix the issue I've taken —twice— the car to the tunnel carwash, which have hot water and a drying device at the end. Last time, to try to solve the issue I filled the lock with oil and open and close it with the fog and with the keys several times after the carwash.
Yet… I figure out that the real problem is that the small door or lid that the lock has to protect it from water and debris is not working properly. It doesn't close the hole for the key completely when the key isn't there.
- Any idea on how to solve this issue? Specially in the middle of the winter. Perhaps I should brush it with an cleaning product for grease or so. Perhaps with some lighter gas since usually is a really good cleaner of grease?
- I read somewhere that some people carry with them "defrosters" for this occasions. What are those? I haven't heard of them.
- Also I read somewhere that oil isn't wood for locks because, in the end it gets dirty and it make things worse. What should I use for these occasions them.
I have to add that at the beginning of the winter —on November— that door suffered a repair on the washer system. On the tubing, which was leaking, and on the pump of the rear washer which was leaking and finally broke. Perhaps the washer liquid —which is one of those for winter conditions and doesn't froze till -30ºC— fall all over the lock and is causing these problems?
OK after reading your comments I think I'm going to take advantage that next weekend is going to be over zero again and try to clean the lock with some lighter fluid. Brush it a little bit and try to put in place the shroud of the lock. Either by cleaning or unbending it. Then, apply some graphite dust or silicone since it seems it's better lubricants for locks.
Is this correct?