There are a lot of temp sensors on this engine. I'll bet someone knows what all of them are or can help piece it together.

The temp sensors I'm aware of are:

- one post by the thermostat
- one post by the upper radiator hose
- two post by the upper radiator hose (105/115?)
- big one post on the head near the glow plugs (temp gauge)
- small one post on the head near the glow plugs

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD

Good question, I noticed this myself.

The one by the t-stat is the 50C temp sender for the trans. It connects to the switchover valve near the blue flying saucer on the fender.

I only recall one near the glow plugs - for the temp guage. The lead for this sensor goes in the glow plug harness and connects up near the glow plug relay.

The 105/115C is used for cycling the A/C at 105C and cutting it off entirely at 115C.

__________________
Brian Toscano