Hello. I have a 2002 Toyota Avalon with 94000 miles. I just had the Timing Belt, Front Engine Seals, and Water Pump replaced (as preventive maintenance). The Toyota Service Tech told me that they change out your coolant when they replace the waterpump. However, I noticed today that the coolant container is only filled to low. I called the service tech at Toyota and inquired about this and was told that the container is simply an "overflow container and it is not necessary to fill this to the Full line." Is this correct or should I take the car back in and ask them to fill it to the full line. My bill shows that I was charged for a gallon of antifreeze. Please help. Thank you.