Yes, that should be the A/C drain hose.
Coolant would be colored whereas water from the A/C would be clear.
There is no reason for the cooling system to be leaking from there. Even if the heater core is leaking, it would not get to the evaporator housing.
Are you sure the coolant is leaking from the A/C drain hose during a pressure test?
Monday, June 7th, 2010 AT 9:40 AM