2002 Rear heat Not Working Anymore...

[TheGuyWho]

Hey guys, been a while...

So since its been cold weather season I just realized that the rear heat no longer blows hot or warm. It blows whatever the outside temperature is or just a bit cooler than that. Air blows thru at whatever speed I turn the knob for, just not the temperature.

About 8 months ago I replaced the front heater core and some blend door items, etc... Front heat works amazing!

Any ideas/assumptions why the rear isn't blowing hot? Is it more likely to be the rear heater core, or blend door, etc...?
Thanks for the help.

 

[stamp11127]

Does the supply and return line to the rear heater core get hot?

 

[MUSKYMAN52]

Possible bad heater core or thermostat?

 

[scarto]

No rear heat

97 Expedition and the a/c works along with the blower motor. Heater hose at the tee under the hood is warm but the hoses to the rear are cool indicating no coolant flow. Is there an electronic valve or switch between the tee and the rear heater core?