G2160 Temp Sender Location?

I'm getting the oveheat indicator flashing on the front panel after about 20 mins of mowing - but the mower is not obviously overheated. The over heat indicator seems to come on when the coolant at the top of the radiator reaches ~158 deg. I'm wondering if the sendor is bad or if maybe the thermostat isn't opening up completely perhaps leading to higher temps in the engine block than the radiator (or perhaps a blockage in the block).

Does anyone know if the temp sender is measuring the coolant temp and if so where? OR... does the sender measure the engine temp in some other manner? If I knew exactly where the sender is and what it is measuring I could draw some conclusions...

Thanks much for any tips,

Mike

Bump... really? No one on this board has any ideas where the temp sender is located or specifically what the overhead light is measuring?

Thank you for your response "Wolfman". This is a big help - as I previously mentioned, the radiator coolent only registers 158 degs when the sender indicates an over-heat situation. Now that I understand where the sender is actually measuring temps at, I can see that it could be measuring higher temps in the engine block than the coolent in the radiator if the thermostat was only partially opening.

Just a followup for other's future reference. Yes, the Temp Sensor is located on the right-hand side of the Thermostat housing just below the level of the thermostat. I ordered a new sensor for ~$40. When I screwed out the old one, I noticed that the head of it was short and squared off... the new sensor had a rounded bullet shaped head. I screwed in the new sensor and problem was resolved... ran like a top all summer.

Yep, that's exactly what I did - measured the rad and hosing with an IR Therm and the reading seemed fine. What I can't figure out is how on earth does that sensor get damaged like that - in my case, probably 1/4" of the tip was just gone! I wouldn't think coolent flow could do that...