Just purchased a used Turf Tiger with a 27 hp Kawasaki liquid cooled engine. Changed all fluids and filters, started to use unit for approx. 3 hrs and it appears the coolant overflow tank is dropping in coolant level approx.1/2". Used it tonight for approx. 1 hr and it appears to have dropped another 1/2" at the overflow tank. Checked everywhere and I am not finding any area that it is leaking out and also checked the engine oil no signs of coolant in oil. So where does the coolant seem to be going or is it just settling in to the airlock that may have been in the system from draining and changing the coolant. The unit is a 2003 model with low hour. Thanks for any HELP.