Yes there is a coolant sensor in the Renault megane.
Renault Megane Dymanique
at the back
When you lift the bonnet look at the back to the right of the engine, there is a small vacuum tube leading to the map sensor that is clip locked to the bodywork approx 2" long by 1" wide.
The coolant temperature sensor in a Renault Megane Scenic is located on the right hand side of the engine as you are looking at it. It is located just above the TDC sensor.
It has to be reset by a Renault dealer (or anyone with a Renault Clip diagnostic).
Next to the air filter box
Will a Renault Megane V Plate ignition barrel fit a Renault Megane Cabriolet R PLate?
how to change Renault megane timing belt
On a Renault Megane Scenic, the output speed sensor is usually situated behind the gearbox. It can only be felt because it is small and has wires connected to it.
The Renault Megane convertible was debuted by the French automaker Renault in 1995. The Megane was unveiled in the fall of 1995 with a unique, safety themed marketing plan.
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