I am trying to find and cure a water coolant leak in a previa 97 petrol auto with no success so far.
Practical problem is, as there is no antifreeze left to colour the water, it is extremely difficult to see the water level in the expansion tank. At the moment adding more antifreeze is an expensive waste of time.
What could i use to colour the water to make it easier to see. How about food colouring? Or would that rot the rubber piping etc? Tks for any ideas.