I don't think that the temp. sensor is the problem. I think that the problem is caused by a throttle control device when it senses the coolant is at a specific temp. By unplugging the temp sensor, the device will never know when that temp is reached and will not do what it has been doing.

That is just my thoughts on why to unplug the sensor. If all of that is confirmed, then you can have a talk with the dealer's parts manager and/or service manager to track down the device that might be defective.

__________________
Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO