My car's cooling system is supposed to hold 7.5L. When i got the car i bought a 5L jug of concentrate and drained and refilled the system with a 50/50 mix. Two months ago i had to replace the water pump and refilled with the previously drained coolant and had to top the level up and can't remember the mix ratio that went in. One thing is sure, the 5L jug is empty so i might be running 33/66 or something along those lines. I really can't remember. What would you do? guess, drain some et add water? flush everything and start fresh to run a correct 50/50 mix?
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