I offered you one at minimal costs and you do not take it. What can I say. The numbers mean, first one - temp to activate the aux fan high speed. 2nd one - temp to cut off A/C.

I use the RED type on my 300SDL which has the same engine as yours. It gives a better margin of error as the #14 is prone to overheat ( IMHO, the problem with # 14 head is overblown ) but it may or may not be necessary. It all depends on your comfort level.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.