I'm losing coolent from the right side front of the motor. I can't find the leak on 2003 Ford Explorer Sport Trac

I changed the water pump the heater valve and hose, the upper and lower raidator hose. i inspected the thremostatt housing for cracks and found none but i'm still losing coolent. I checked the oil for water mixture and it's ok can you help?

Asked by for the 2003 Ford Explorer Sport Trac
the intake manifold gasket is a common leak point. the gasket rots out and leaks.