Just a thought on my old 16 Pilot if you have Eco button on it cuts down the effectiveness of the heater and a/c. If you turn it off it gets warmer and cooler air through the vents. I’m guessing the Passport is the same way. I know some are having issues that need fixed but for others maybe try turning Eco off.I have noticed Passport A/C blows fine, but does not seem to cool as well as prior vehicles. Would a faulty evaporator gasket cause the problem?