On the shifter light, try:

http://www.peachparts.com/shopforum/showthread.php?threadid=25514&highlight=shift%2A+light

On the overheating, do check out the fans as a likely culprit, but out of curiousity, when was the last time the cooling system was flushed and re-filled, and the thermostat checked? 300Es don't like to go without fluid changes every couple of years, as it can impact lots of things, including the water pump. Good luck!

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E