overheathing problem =(

[napor]

I have done a lot of reseach and done a couple of things to my stock ka24de and still does it.... Everything started when my original radiator blew up... replaced radiator and then after a couple of weeks, my car started to over heat ever sence, it only does it when im driving it, after 10 minutes or so... it never does it when is idling even if i have it runing for a half hour, at first i will not have heat, and as the temp. gauge starts to go up, i get heat, then after 5 minutes or so my temperature gauge starts to come down to normal temp. at first i tough i had a bad thermostat, so i replace it 2 times, my first one was for a autozone one, still did the same things, so i replace it with a nissan one, still the same, i also noticed my lower hose never gets the same temperature as the upper hose, in any situation hot, cold normal running conditions, i bleed the system thinking is a buble in the system, that kinda stop it for a while like 2 or 3 weeks but then started again, i pressure tested it. i don't know what else i can do. please some help would be really apreciated. thanks guys

[ska]

check your waterpump

[napor]

what you mean? like take it out and check it if the fins are good?....
thanks..

[murda-c]

when you say 'have heat' are you talking about the heat through the blower inside the car?

make sure that works and there is no bubble in that system.

Might want to check on your headgasket as well.

[napor]

Yes that what i ment, like hot air coming out of my vents.... and by what i see it looks like it has been a headgasket replacement before.... i say that cuz of the the type of sylicone all arround the head, valve cover and oil pan. it's red and a lil messy. clearly not from factory.

[camaro379ss]

what do you mean silcione around the head? maybe I am not reading this right but do you mean between the head and block?

if it were waterpump related it would be leaking out the weep hole....generally

When you pressure tested what did you find? Do you have white smoke out the exhaust? Are you sure you got all the air out of the system?

Possible clog in the heater core?

[curbhuggerrps13]

i vote water pump and air in the system. might as well replace it since im sure its old and worn by now.

[ska]

what you mean? like take it out and check it if the fins are good?....
thanks..

just check for leaks around the pump and any free play on the pulley. dont know if a waterpump can internally be defective but if its old i'd replace it.

[camaro379ss]

wouldnt hurt to replace it anyways since its sounds like you have replaced everything else

[curbhuggerrps13]

how many miles are on said car?

[napor]

what do you mean silcione around the head? maybe I am not reading this right but do you mean between the head and block?

if it were waterpump related it would be leaking out the weep hole....generally

When you pressure tested what did you find? Do you have white smoke out the exhaust? Are you sure you got all the air out of the system?

Possible clog in the heater core?

Yes i ment silicone between the head sorry for not explain it better. No no white/black smoke coming out, and yes i got all the air out tru the bleeder whole.

[napor]

and now well im guessing next step is going to be my water pump to check it since i have not done that car has 134k on it, and most likely replace it. Thanks for the help guys...