My heat sucks

Possibly the door in the heater box that determines hot or cold air flow is not moving with your slide control. Are the heater hoses themselves hot?
The door doesn't move at all, It's been rubberbanded shut every winter since we bought the car. :D And as for the heater hoses, yes, they were hot before and after I relocated them.

my valiant does this every winter. i back flush the heater core and good to go till next winter. good luck.
The heater core was the first thing I flushed before I focused on the rest of the cooling system.