S2 Rb25 boiling in coolant lines

[Orbea Occam Am]

Hello guys, new here on the forum from Texas! Ive been in the nissan scene since 04'..Anyways, i have purchased a rb25 from the jdm importers over here.The motor seems to be great, until i turn on the a/c. I get a boil in the back of the motor that continues to boil the more i drive...Or if i shut off the a/c, boil will eventully stop once temp gets to 195f-198.. If i drive with the a/c off it will stay at 195f-198f.. If i drive with the a/c on it will stay around 210f-212F.. It never has shot coolant out to the reservoir, like a overheat condition... Tried multiple radiator caps.  Im aware of turbo thermosyponing boil after the motor is off...But, this boil i have is with motor running while i drive, if i really trash on it the boil will spread to the upper radiator hose, only with a/c on...IM STUMPED and i dont want another sr20 lol ..Please help me guys!

Heres a list of everything that is good. Headgasket, thermostat, new dual row aluminum radiator, Good clean condensor, condensor fan works fine , clutch fan, fan shroud, coolant 50/50 also tried 70/30 distilled.. heater core is good. Water pump is very strong..All hoses are new, no coolant leaks at all..Even added a bleeder valve on my heater core hose to bleed air..

Does have a freddy intake manifold with a new cometic gasket properly torqued down. No smoke in tail pipe, no oil in coolant, spark plugs are great..

Passed headgasket chemical combustion test and leak down test radiator/coolant system pressure test.

The motor works perfectly fine idles great, but i have a boil when a/c is on.

O yea forgot..ambient temps are 100f here haha

 

 

 

Edited August 4, 2016 by Orbea Occam Am

[KiwiRS4T]

Not using any water? These engines are notoriously difficult to bleed. Not sure what the a/c is doing but if you are using a Freddy manifold you are probably missing the front bleed valve that is there on the stock set up. What people do is jack up the front of the car and jam a cut off coke bottle (for example) in the radiator neck and keep filling with water as the engine warms up on idle.

[Orbea Occam Am]

7 hours ago, KiwiRS4T said:

Not using any water? These engines are notoriously difficult to bleed. Not sure what the a/c is doing but if you are using a Freddy manifold you are probably missing the front bleed valve that is there on the stock set up. What people do is jack up the front of the car and jam a cut off coke bottle (for example) in the radiator neck and keep filling with water as the engine warms up on idle.

Yes ive done this many times...ive tried 70/30 coolant mixture distilled water...installed bleeder valve on upper heater core hose

Edited August 4, 2016 by Orbea Occam Am

[Orbea Occam Am]

Yolo?

[Orbea Occam Am]

Well thanks for all your help guys..

Turns out turbo water return is supposted to be connected at the tee off of the thermostat housing and not the tee in the back of the block..

No more gurgling heater hoses. Took about 500 pages of research online, to find one with my same problem.

Heres the link for the other jerkoffs out there with the same problem.

Good day mate.

http://forums.nicoclub.com/rb25det-pull-write-ups-abound-for-noobs-and-others-t194781.html

 

Edited August 11, 2016 by Orbea Occam Am