Bleeding is a good idea but, 201 heater cores and veater control valves will leak as well. The heater core is tough to see but, the heater control valve isn't bad, just apply pressure and look through the r/h cowl cover.
Test that cap as well, I've seen some lose coolant for no reason only to find a dead pressure cap.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.