New Nissens heater core fixed my uneven heat.
Original was also leaking so didn’t bother trying to flush first.

 

I bought the Heater Core and the Vent Doors but never installed them. Still in a box at the mechanics place.
But this is the solution. After 3 or 4 years with little to no heat we were able to get by with heated front seats but one has stopped working but on the right side where a little heat came out of it last year started to put out more heat .We really should take care of it but there have been so many repairs required.
Right now am trying to solve Suspension Fault..we did rear Valve Block & Front Valve Block and now will be doing Hitachi Compressor & Relay.
If that doesn't solve it next is Middle Valve Block. Also there is a Communications fault that has to be found.
But for the Heat issue Heater Core is usual solution..my mechanic said might as well get the four vent doors.