Overheating at high rpms or high speed only

[Eramo323]

Raidiator bubbles :/ - YouTube (http://www.youtube.com/watch?v=Y-l0He74lAQ&feature=g-upl)

Only overheating at high RPMS and or High Speed
Thermostat was removed because i thought it was possibly stuck closed
fan clutch is working properly (or so I think?)
no signs of leaks -.-
I provided a video that i uploaded to YouTube showing tiny air bubbles every time i give the engine gas...
I'm thinking possible head gasket?
Not sure tho, There is no coolant in the oil or oil in the coolant and no white smoke coming from the tail pipe

[s13mikesr20]

Outer headgasket is muffed up recommend radiator pressure text and leak down test

[shagspeed]

Outer headgasket is muffed up recommend radiator pressure text and leak down test

DO NOT remove the thermostat .... The dam SR20 pumps flow crazy volume... The Thermostat acts as a restriction .. You take it out and for sure it will over heat .... The water passes the core quick enough it can't cool.. A larger radiator will help put at least cut out the spring and maybe the diaphragm if its truly stuck but water volume needs to be slowed down ...

Also bubbles could be that the water is boiling in the block or head .. This too is very bad if air gets stuck in the block as it will create hot spots and I have seen engines lost to this as well ...

I recommend running Evans NRG+ if you can afford it.. It will not boil tell 375* and it doesn't expand .. You can also run a ZERO or LOW pressure cap and it will be easier on all your coolant lines as well ..

1. Replace TSTAT
2. Evans NRG+ Coolants » Engine Cooling Systems (http://www.evanscooling.com/products/coolants/)
3. Optional - Low or Zero pressure cap ..

Hope that helps ..

[dawagarage]

higher rpms/speeds = more rpms = more explosions = more heat.
step up your cooling system. (your probably knew this.. maybe the next person doesnt?)

also, something else i recently learned about, (in regards to you removing the thermostat that acts as a restrictor) is cavitation damage to front cover, water pump, etc.)

[Prozac]

Get a thermostat , cooling requires time!

Bubbles , you either have air in your cooling system or headgasket problem , feeding back crankcase pressure into cooling system. Start the car cold with the rad cap off get up to operatiing temp, holding throttle around 3k rpm , once your thermostat opens you should get a flow , throttle the engine and watch for bubbles , burp the cooling system of air you should have a bleeder screw on the neck 10m open it wait for fluid and tighten. Let cool down remove rad cap ,start car hold throttle at around 2.5 rpm and if you get bubbles you have Mild HG problem that could blow a rad , hoses and more.

[RU4REAL]

It wouldn't hurt to check your timing. SR's like 15 degrees. Anything less, you'll get heat soaked and temps will rise.

[Natural Aspirations]

Looks like you need a head gasket. Have you figured it out if not I can help.

[JFoxx]

something else that could effect it are pinholes in your cooling system, they will draw air into your cooling system (wont leak) and sr absolutely hate air in the system, it happend to me before....

[steve shadows]

Raidiator bubbles :/ - YouTube (http://www.youtube.com/watch?v=Y-l0He74lAQ&feature=g-upl)

Only overheating at high RPMS and or High Speed
Thermostat was removed because i thought it was possibly stuck closed
fan clutch is working properly (or so I think?)
no signs of leaks -.-
I provided a video that i uploaded to YouTube showing tiny air bubbles every time i give the engine gas...
I'm thinking possible head gasket?
Not sure tho, There is no coolant in the oil or oil in the coolant and no white smoke coming from the tail pipe

You should always run a thermostat...it helps keep the pressure in the cooling system at the correct level. Get a nismo one asap. Also I would do a leak down and compression test when the motor is cold to see if anything on the head is leaking. Good luck!

[Wookie384]

It might be a long shot but with the thermostat out, the cooling system is flowing too freely, and every-time your at high engine speeds the water pump could be cavitating causing air to separate from the coolant and appear in the system.

[240shawty]

im pretty sure that running the engine with the radiator cap off bleeds the coolant system of air.....

[240shawty]

like the wookie mobile

[rb25_s13*CHUKI]

im pretty sure that running the engine with the radiator cap off bleeds the coolant system of air.....

Hold up pause that motion, that is false son!

[JFoxx]

^^^ what he said..... but a swirl pot will....

[240shawty]

well please inform me then

[wangan_cruiser]

Bubbles 100%

[Wookie384]

like the wookie mobile


uhhhh....what are you trying to say? lol

[Kingtal0n]

you can also get bubbles if the coolant is contaminated with power steering fluid or any number of other car related fluids.

Pressure the coolant system with the engine off and check for leaks. A leak can let water out, or air in. Do NOT flip out and automatically assume the headgasket is toast.

And, I see metal end tanks. Is that a KA radiator?

[Eramo323]

water pump gasket was fucked!

[jt1583]

I believe you but how would air get into the coolant system from a bad WP gasket? Just curious, glad you found the issue.

[Eramo323]

^^^ no clue but I replaced it and the thermostat housing gasket and it stopped heating up and losing coolant

[shaggy sr]

the same happened to me. check my thread. Maybe it will help u

[fliprayzin240sx]

I believe you but how would air get into the coolant system from a bad WP gasket? Just curious, glad you found the issue.

Serious question? What happens when you pour water out of a cup? Does the water level stay the same?