I fill it up to the max line on the overflow bottle (never over) and then over a few weeks it goes to below the low line (when cold).

Rossco, for some reason I thought that it would be better for the engine to run cooler than stock. Too late now, stupid I know . But most of the days I the car spends idling in traffic to and from work, so that is the reason I wanted it to be a bit cooler.

Why would air in the cooling system cause my car to use coolant? The car has never overheated, and the temp gauge is in the middle of the gauge once warm, never goes over half.

Adi