Question: How to add coolant to your car.
Option 0: Only when car is cool, if coolant is low, remove coolant reservoir cap and using a funnel add coolant (a 50/50 mix) to the reservoir until way past the fill line.
Option 1: Only when car is cool, if coolant is low, remove coolant reservoir cap and using a funnel add coolant (a 50/50 mix) to the reservoir until near the fill line.
Answer: 1