Where is the coolant temperature sensor located?

Hello,

The coolant temperature sensor is located on the thermostat housing.
If you open the hood and follow for the radiator hose from the radiator to the engine, you will find the thermostat housing and the coolant temperature sensor is screwed on to that housing.

Since Vauxhall is not sold in the USA, I do not have a diagram with the replacement procedure.
I have attached a picture for your reference.

Please let me know if you have any questions.
Thank you.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Thanks Sean. I'll have a look in the morning, appreciate the help.

You are welcome. Let me know if you are able to find it.

Will do thanks. Can I ask you another question?

Yes, of course.

Thanks where is the ambient air sensor? As was told that would sort my temperature read out on my clock so I've got one of them too.

The ambient air sensor is located right behind the front grille. Look at the picture below. Its approximately where the red mark is.

Thanks again.

You are welcome.