How can I find a good and detailed mechanical car manual?

We can definitely help you. However, if you are looking for specific info for your vehicle, I would recommend using All Data online manual. That is what we use and are happy to provide the info from the manual on specific issues that you have.

The unfortunate thing with this vehicle is we are located in the USA and are limited to the manuals on the vehicles that are offered here. So the Getz is not one of them however, the Accent is the sister vehicle and is similar.

If you are getting coolant in the engine then that is most likely the head gasket but if you have not confirmed it then here is a guide that we have that will take you step by step through how to check the head gasket:

https://www.2carpros.com/articles/head-gasket-blown-test

I will also attached the info from the manual on this process for the 1.6L which is the sister vehicle to your vehicle and will be very close to the same process on how to replace the gasket on your vehicle.

However, if you sign up with All Data in your country then they will provide the info that you are looking for on this specific vehicle.

Please let me know if you have other questions. Thanks

Thank you very much for the quick detailed and professional answer that allows me to continue my work.
Regards

You are welcome. Please come back to 2CarPros next time you need something. Even if we don't have a manual that gives specifics, we can get you close and we also have an entire library of guides that will help with general info on how to do something or what to do with common issues.

We are happy to help however, we can. Thanks again.