Chevrolet Kalos cooling temperature sensor.

Greetings to all, I am new here.
I have a failure in a Chevrolet Kalos, 1.4 16V 94 hp,
to which the release is not stable in cold, rises of revolutions, I think the problem is in the refrigerant temperature sensor, because in summer the failure is the setback the reverse is very low, you even get to,
I want to change said sensor but I do not find where it is, I have looked in the manuals published and I would not find its location. If someone can guide me in the location and change of this sensor.

Friend the temperature sensors are mounted on the butt or in the body of water, specifically the kalos I have not seen, but they are always at hand, it is a sensor with a two cable connector if you put a photo you want to help you better.

Thank you,
I have already found it under the admission collector, but to change it you have to get under the car, using an elevator, it is not in sight.

ok thanks for letting us