Some cars have a difficult time starting when it is just above the freezing mark. This is due to the fact the glow plugs do not come on if the temps are above 9*C or 48*F (or somewhere around there). Any warmer and the ambient temp is usually ok to start fine and any colder than that and the plugs will glow to asist with starting. Of course there is a margin of error a few degrees either way. Also, atmoshperic pressure will affect your glow time too. The higher the pressure, the shorter the glow time. Thats why people at higher elevations will have a longer glow time, even above 9*C.

So in order to extend the glow time, you simply have to log into the engine module and make an adaptation change in group 12.

Here are the directions:

1. Turn on ignition
2. Go to engine controler
3. Log in using 12233 as the code
4. Click on Adaptation and go to group 12.
5. Change adaptation number from 32768 (default) to somewhere around 32700
6. Click test, then save the new value.
7. Close controler
8. Turn off ignition and turn back on again.
9. Go to the engine controler & log in again.
10. Go to adaptation block 12 and you should see a change in the second window. This value is the amount of time in seconds that the glow plugs will be active.

Note, you must do this with a cold engine to be able to see the results of your adaptation. You can do the adaptation at any time, but won't notice anything till the engine temp is cold. Also, the new glow time will not appear in the second window (no units) after you do the adaptaion. You must turn the ignition off & on and re-log in to the engine controler to see the results of the adaptation.

Information from Wingnut's TDIClub post where there are screenshots availabe.