how can i tell if the headgasket is blown or needs to be placed losing coolant, coolant light comes on it is -19 we added .50L of premix coolant today. does annyone know where the harness is for checkingn engine codes

 

what year car is this and model. But the main things that point to a head gasket is

- white smoke from exhaust
- loss of coolant
- overheating issues
- low compression in cylinders

 

There is like... 3 of these lol