Can you just top up with more coolant in your Skoda fabia or do you need to drain away the old stuff?

You can top up the coolant in your Skoda Fabia if it is low, but it's important to ensure that the new coolant is compatible with the existing one. However, if the coolant appears dirty or has been in the system for a long time, it's best to drain the old coolant and replace it entirely for optimal performance. Regularly checking and maintaining the coolant system will help prevent overheating and other issues. Always consult your owner's manual for specific recommendations.