Radiator Losing Fluid

My problem is the radiator is losing fluid on my 91 Honda Accord EX. The water pump and thermostat have just been replaced. Also, the pressure test did not show any leak and there were no visible leaks on my driveway or pavement. Any suggestions as to why this may be happening?

How much fluid is being lost? Was (is) the car overheating?

If there are no leaks that can be detected, there’s only one possibility. The coolant has to be going out the exhaust. This means a leaking head gasket.

How many miles on this Accord?