Lawone

Good afternoon people,

I'm finding my radiator cap is popping and pushing some water into the over flow tank after shutdown. Even after going cool down drive.

Turbo is a GTX2867R

Feed is from side of block.
Exit is to mixing manifold nipple.

You can feel the bubbling from the exit water pipe from the turbo.

The turbo is not clocked. (I read Garrett suggest 20 degrees angle to help thermal spihon)

On the back of this I fitted a 22-24lbs radiator cap to tackle this but it still does it. The cap also does not pull any water back in after it has cooled down. When removing the cap there is zero pressure just if anyone asks if it's still under pressure.

Few people have said don't worry about it. It's better to that the turbo at 0' rather than 20' due to oil flow.

Old photo showing how the pipes are.




Just wondering if anyone has any ideas or advise for me to try?

Thanks.

Braineack

iTrader: (62)

rotate the hose so it goes under the hot-***-air intake

Lawone

Thank you.
I guess it would make sense. If it still does the same. Any other suggestion. Just want a collection of ideas if it comes to it.

fooger03

iTrader: (2)

pressure test your cooling system - something's not right if it's not fully pressurized after shutdown.

Lawone

I did a few months back.. Have a slight hiss noise from the water feed pipe when it goes into the AN fitting connector.. Possible? it's sucking in air.

I just pushed it with my hand and it stopped. no drips or nothing just a ever so slight hiss.

shuiend

iTrader: (24)

Can you tighten it just a little more.

Lawone

Going to remove and redo the fitting. It's the AN fittings you slide the pipe on then tighten up.

psyber_0ptix

iTrader: (4)

is it a compression fitting?

shuiend

iTrader: (24)

​​​​​​​Well then that sucks.

Lawone

AN -6 (AN6 JIC -6 AN 06) 90 Degree ULTRAFLOW Swivel Seal Hose Fitting In BLACK | eBay

^^ this is what I used.

psyber_0ptix

iTrader: (4)

Oh yea those. I either use the Aeroquip socketless or go to a hydraulics shop to crimp on ends. Hopefully its a pretty easy fix, but you definitely want to have that coolant system buttoned down tight.

Lawone

I am right in saying that.

If I have a coolant leak.. even if it does not leak (enough for air). It will effect the boiling temperature which could be the cause of why after shut down the turbo boils the water as it isn't pressurised as it should be. But is fine during normal use.

jimmygs3

A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it. The lower the pressure of a gas above a liquid, the lower the temperature at which the liquid will boil.

I wouldn't say it was fine, normal use includes shutting down.

fooger03

iTrader: (2)

any leak in the cooling system is a bad leak. a pinhole can and will cause boiling which can lead to overheating and an early engine death.

Lawone

Thanks for the advise people.

Can pulls fine gets to about 88-89c after loads of hard pulls all the way to 6th gear 6500rpm.

It's only on shut down even after cool down drive that it bubbles. You can hear the turbo gargling away then hear what sounds like bubbles pulsing up the water line exit of the turbo.

99mx5

iTrader: (16)

Maybe replace the radiator cap?

Lawone

Already done that. Fitted a Stant 22-24lbs cap and still does the same.

Lawone

Little update.

Will be rerouting the line to go under see if that makes any different.

I have also ordered a relay timer. Which I will hook up directly to the fans off the battery / fuse box 12v to be used with a push bottom to activate it.

This will allow the fans to be on for x amount of time. Will do 3mins and see how I go. When the car is off.

Almost like a turbo timer but only for the fans.


I'm hoping the effect of the fans on it may just stop the turbo boiling the water causing steam and building the pressure to make the CAP pop.

shuiend

iTrader: (24)

Can you look in the phone book and find a local hydraulic shop. Then have them make you a new line and see if it still makes the noise. If you can push the line around and get the hissing to stop, then I would be looking to replace the line.

psyber_0ptix

iTrader: (4)

Cliffnotes for those just entering this thread:

"Hi my coolant bubbles because pressure isn't being kept in my cooling system. I've done everything. What should I do?"

Did you pressure test?

"Yes, I have a leak. I'll do something else that doesn't address sealing any pressure loss, but I wonder what it could be."

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