93 prelude... well, i changed the headgasket along with the thermostat. But for some reason the heater is not as hot as before (its just warm). I tried bleeding it when the car is warmed up with the heater to full blast. Am I doing it right? I searched but some say that you need to bleed it when the car is off and cold. Is that true?

 

yep. keep bleeding it till the heater is hot.

 

if your heater is weak you have air in the system. here is one way of getting air out of your system without bleeding. when the car is COLD, start the car, run the heat, take your raidator cap off and ad coolant as needed. or bleed the system with the bleeder vavle on the thremostat housing.