240sx overheating problem. (for the love of god!sumone help me plz)

[Ryan_2.4litereater]

so check this out. i have replaced my water pump, thermostat, radiator, radiator cap. and yet there is no leak, thank god. but after about 20 mins of driving, the needle will creep up. however the car never over heated with all these replacements untill my heater core blew. i dnt see how that would affect it, i just pulled the 2 hoses out of the firewall and conected them, so theres circulation, with the corect pressure(im assuming). does the heater core have something to do with it? oh and i checked my oil and its not milky so theres no warped block or nething. ne of ya'll kno wut the deal is.? i need this fixed once and for all, i been at this for bout7 mnths.

your help is appreciated!!!

[jismo]

i dont know.but i think u my have air present in your coolant system. crack the bleeder screw open,be careful not to snap the bolt head off.

[jismo]

and u didnt put the thremostat in backwards right.

[Ryan_2.4litereater]

yeah. ive done that before. ill put the heater on full blast for a good while. im sure theres no air bubbles. now the bleeder screw is that screw at the bottom of the radiator right. (just makin sure) and the thermostat was replaced a while back so its very vague to me, but im positive its in right. the car would instantly over heat if that was the case right???

[jismo]

no thats the radiator petcock. the bleeder screw is on the intake manifoldin front of the upper rad hose. KA24de right.

[jismo]

for your thremostat question. YES

[Ryan_2.4litereater]

yeah ka24de. but ill check that out i guess. id b pissed if its an air bubble hidding in there this whole time. but with my luck, thats probly not it. will turning on the heater full blast, not cure that problem??

and in that case. yes i put the thermostat in right.