Hmmm...blower hot on my feet & cold in my face

[TBayToyotaBoy]

I'm confused, always driven old-skool Yotas and never had this problem. Heater vents blowing hot on the feet, cool/barely warm thru the dash. I flushed the whole darned system, no good. Okay, removed the core hoses and flushed just the core @ relatively high pressure...nothing. Reversed the inlet/outlet hoses, now marginally better but still sucking too much for a Thunder Bay winter (-20 in January).

Has anyone heard of a heater core only getting, um, half-blocked? I checked the vents, no leaks or anything...the coolant ran out nice'n'clear so there's no actual evidence of a blockage, but I'm finally stumped.