The History: About 4 weeks ago when cold weather started I noticed that, when I drove off first thing in the morning, my car was not automatically changing up through the gears (I mention the cold weather because I thought something may have become frozen with temp down to -11 at night). I tried to change gear using Tiptronic but no joy. So I stopped, put it in PARK and turned off engine. Then restarted and tiptronic worked fine. Drove off again in DRIVE and everything was working perfectly with smooth gear changes (up & down). A few days later had similar issue and resolved it by repeating the same process. It happened a couple more times since and resolved again as above. Then this morning, stuck in 1st gear again but despite stopping and trying my original "solution" it would not move through gears and Tiptronic did nothing (still displays "DW" on instrument cluster).
Other things that I have also noticed since the big freeze is that (a) the central locking fuse kept on blowing every morning I unlocked the car when frozen - I assumed that as the boot was frozen stuck that this may have been the cause as this hasn't happened since the milder weather; (b) when I push the S/W switch (Summer / Winter) it has no affect and will not change from its current setting (W). I mention these two points in case they are somehow relevant.
I have no warning lights on. Vehicle has just passed the 99k miles mark and has been regularly serviced at MB garage (I am not working anymore so would prefer to try and avoid going to MB garage for financial reasons).
Any help / advice very much appreciated.
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Tuesday, January 13th, 2009 AT 1:06 PM
