LCD Display problem
Just yesterday, I had the same problem on my early 05 Jetta. Found your post while searching for a solution. I think I caused my own problem when adding coolant (in a sloppy manner) a couple of weeks ago, after replacing my coolant temperature sensor. It appears that I have corrected the problem. Only time will tell. I removed the connector from the coolant tank, and looking at it closely with a loop (magnifying glass), I could see corrosion. I use Deoxit to clean both the connector blades, and the receiving connector half. I used a very small screwdriver to spread the blade receiver part, to get the fluid in. I then connected and re-connected the halves together about a dozen times, and then dried up any excess fluid. Prior to the fix, I had no digital display of the clock, or center shift display (automatic). Strangely, I had display of mileage, and trip counter. But neither one worked! All now seems to be back to normal. Hope it all stays that way. Thanks to all the members postings. Without them, I would never had the faintest idea on where to start. By the way, there seems to be a lot of anti-oxidation products on the market, but they really only prevent oxidation, rather than the Deoxit, which seems to remove it, and protect it. Good Luck! Jack
Do a search on coolant migration.