hello, i've got an older civic and today noticed that the engine was heating up going up to H, got to a gas station and stopped and noticed that there was no coolant......bought some coolant and this seemed to help. Everytime i am cruising it is fine it is when i stop at a light it creeps up and when i accelerate that it creeps up for a bit. Does it take some time for the coolant to make it everywhere and work? After adding the coolant i have about a 5 mile ride home and it was still acting funny. any ideas?