Hi, guys.

The weather has warmed up, the mornings are cold, but during the day it exceeds 10℃ (50°F).
After the change in temperatures during the gout, the starting of the car also deteriorated.
During the morning when the temperature is under 7℃ (44°F) the car starts perfectly, but as soon as the temperature rises, the car starts smoothly for 3-4 seconds.
I was able to read on the forum that the coolant sensor can also cause this.
The battery is fine, I think the glow plugs are fine too, in winter the car started without problems.

This problem only manifests on first start, for example when I finish work, if I stop at the shop on the way home and carefully start the car, it starts without any problems.
I've read that in warmer weather the glow plugs don't burn as much as they do in cold weather, that's why people on the forum wrote that a faulty coolant sensor could be causing it.
I would therefore like to replace it.
The question is, where exactly is this sensor located? I found a video where the sensor is visible, but it was a TSI engine, in my case it is a 2.0 CRTDI 150HP (CRMB) .
Another question is, is it necessary to pressurize the cooling system after replacing the sensor? If so, how? 
Thanks in advance for the answers, and sorry for the grammar, I used a translator.



 

Hello Homeless, unable to help with the sensor location, but can advise that it's not necessary to pressurise the cooling system - there is no (or low pressure) when cold, the system pressure builds up as the system heats up.

Oh thank you for info!