i thought box heated up and the blend door opened wen u turned knob to heat to let it flow to the vents..
ok...so wat could it be? the box heated up good and the blend door was off...so why didnt the heat make it to the vents???
ok then , with my blend door removed and the heater core bein open in the box it should blow heat ..... right?
have you tried clearing the lines? last time i had cold air my lines were clogged and my vents were full of crap like leaves and what not.. there may be somethin in there blocking the passage.. just a thought...