Inlet hose to firewall VERY HOT.... outlet hose from firewall COOL.. Pulled off both hoses at the front of engine and blew compressed air 1st in one h ose (dumping the gunk out) then reversed and used a funnel to pour in WARM water then forced the compressed air the other direction (hose). Cabin nice and toasty now !
Also note there is a VERY THIN vacuum "T" just to the right of the engine c oolant overflow bottle. If this comes loose, you lose the ability to choose where air comes from inside the cabin. Just an FYI if this happens to you.