Tuareg 2.5 TDI starts bad

Hello friends, greetings to all. It needs some help because I have a 2004 Tuareg 2.5 TDI and the truth costs you a world especially cold if you can give me a hand I would appreciate it and if not too. Another thing if you can also tell me where the temperature sensor is going, it would be great good to the truth what you can contribute good is thanks and a greeting.

The sensor is normally in the thermostat box but before changing it disassembles it and sees the characteristics because there are several types of sensors, eye check the pressure returns or it may be that the system is downloaded, sometimes air aspires by the valve it carries in the filter.