2005 z71 suburban(stock) cooling system issues

[Special-Ed]

i think i may be kind of "special" but how does one bleed the air out of the cooling system.

its a fully loaded but stock 2005 z71 suburban, stock 5.3l

i know my blend motors are good as i have ripped the dash out to verify and check. my heater core is acting like it has an air-lock... little to no heat. i was bored so manually checked even though my buddies scanner activated all motors. he says you live in florida... you dont need heat... idiot!

everything was fine until i had to put a new water pump ans t stat in last spring and thats when i started to get the "no heat" situation. but living in florida i am not so worried about it... but now its bothering me and must be fixed!

the feed hose to heater core is hot and the return is warm(not as hot)... i just checked the rear heat for kicks and giggles.... nothing its ambient temperature... odd that they get fed by same feeds.... hmmm

also i have burned about 1/2 gallon of dexcool in a year...no visible leaks. put dye in it for black light. no evidence on the spark plugs either... also no signs of exhaust gases in coolant either, this i think may be a bad pressurized cooling cap.

engine runs strong no codes no real issues... in fact i would drive to california tommorow and not think twice...

thanks in advance.

[Special-Ed]

bump....

with all the talent here i figured somebody would have the answer...

[Special-Ed]

ok finally got this resolved....

looks like the d&p blend doors lost home position...

pulled the ac control module for about 30 minutes... cleaned inside the dash, under speedo etc, it was gross from the florida georgia sand clay dust...

reinstalled module... it recalibrated the hot/cold blend door positions and the heat works just fine.