american steel
Full Access Members
There is a restrictor in one of the heater hoses. Usually when there is trash in the system it will also collect inside the hoses. You may want to remove the hoses from the engine first and inspect the inside. The quick connects on the heater core are just that. They can be a real pain to get off. Watch out for the two o-rings and spacer used on them. I replaced the o-rings with some from a hardware store.
I was at my shop with the intentions of doing this but I went inside my office and started on paperwork (damn taxes and bills) and I forgot to go back to work on my expedition.
when I got home I realized what I did and couldn't believe it, so ill go back to there Sunday noon and do that.
ill update with the fix