Please help my dumb*** with a heater hose question

[hdglide]

I've found a ton of threads about my issue but none seems to answer my question. I'm trying to determine which port on the heater core is the inlet. Facing the firewall from the front of the vehicle is it the one on the right or left? dumb question I know.

Secondly...if I install a T in the heater hose, regardless of it it's in the inlet or outlet will it serve as a bleeder valve? I THINK my radiator cap went bad a few weeks ago and allowed my coolant level to get low possibly letting some air in the system. I started noticing the water gurgling sound in the dash and apparently from searching these forums it's air in the system.

I don't think there's any blockage in my system because using my temp gun the temperature is the same on all of the heater and radiator hoses and the radiator and heater core was replaced about 3 years ago. I'm going to replace the thermostat and want to make sure I get the air out of the system. Any and all information appreciated

 

[tcwaltz]

I think the one of the right is the inlet and the one on the left is the outlet. The one on the left goes down to the back of the passenger side cylinder head where the coolant bypass tube is. That runs under the intake to the back of the water pump hosing and I think that is a suction line. If you have rear AC you likely already have some T's. Yes you can add a T there (from say like a flush kit). I never had to bleed anything when I put the new motor in my truck. I filled up the degas bottle as much as possible, started the truck and kept adding coolant water mix. Temp has always been spot on. If its sealed it should pull the air out and the place you are most likely to get air is in the heater core which is the highest point.

 

[tcwaltz]

so I kinda put this together since there is nothing anywhere that specifically diagrams how the Expedition 5.4L works. I'm relatively sure that the water pump pushed coolant to both heads (based on the 4.6L mustang diagrams I've seen which should be able the same.) they bridge across the intake manifold to the T stat and out to the radiator. The water supply for heat comes off the passenger side. There is a T is both the supply and returns to take care of the rear. Rear return is sucked in from the bypass tube.

If anyone else things this is wrong let me know and I'll update the diagram.

 

[Habbibie]

Just saw that pic TC posted in a different thread and I was gonna say a picture is worth a thousand words.

 

[stamp11127]

The 5.4's don't look right without the blower on them.

Tcwaltz, start a new thread in the heating/cooling section with the pic and I'll make it a sticky.

 

[tcwaltz]

Will Do.