Nav system acting screwy in hot weather
 

The other day when temperatures hit nearly 100 F, the Nav system in my 2005 X5 started acting majorly funny. First it stopped given directions. Then while in split screen mode the left side of the screen showing the map went completely blank just showing the cursor stuck in the middle of the display. When I got home I went to eject the Nav DVD (latest version) and noticed that the NAV DVD computer was quite hot to the touch (not sure if this is normal). After the car cooled down the Nav system seemed to work just fine.

Over the next couple of days the nav system acted in a simliar manner. Since temperatures have dropped to the 80's the system seems to be working fine.

Has anyone experienced anything like this? I'm even thinking of mounting a large heatsink to the top of the NAV DVD computer to dissipate some of this heat if that is the culprit.

Nav cooling...
 

You may want to first check to see if the MkIV unit you have has an internal fan. Perhaps it went bad and simply needs replacement?

Yes, certainly have. My dealer swapped out my Mk4 Navicomp under warranty as it was thought the fan was u/s.

My symptoms were slightly different - failure to recognise the map, continual rebooting etc. When I ejected the DVD, it was roasting hot.

However, since the replacement was fitted, I haven't had the car left out in the sun for long periods even though we've had temperatures here in the mid to late 30's :thumbup:

Nav fan
 

Thanks for the tip on the navagation unit having a fan; I had no idea! I'll poke around it to see if I can see it working, but for certain I will mention this to the dealer at my next visit. Thanks again guys you are awesome!