The temperature sensor is the one that is next to air filter, EGR and, facing the engine, to the left of the timimg chain cover.

Call Phil, at Fastlane, and he can help u. It is a simple screw off and screw on. REPLACE ON A COLD ENGINE. U don't want hot coolant all over u.

I would suggest u replace ur water thermostat. That is next to the temp sensor. May solve ur high temp problem.

Also, use only MB coolant or Honda coolant. The other after market ones do not do a good job.