Coolant boiling on Shutdown - Yes theres a way to avoid it

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (purple5ive)

Fri, 05 Oct 2012 09:30:53 GMT

yeah, its only somethign i thought of doing just to check and see if it makes a difference...
not really sure how air in the system(if there was any) can magically dissapear when the car is cooled down while idling and the boiling doesnt happen anymore...
i found running the heater makes a big difference..

im leaning towards the theory of its def coolant boiling in the turbo lines rather than the air in the cooling system.. (although it could be both happening at the same time)

good to hear that its working for some people.

btw the boiling doesnt happen straight away for me, it takes about 10-15 secs to start making the noise and last for about a minute or so(guessing )\

cheers

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (MIDN1T3)

Fri, 05 Oct 2012 07:20:59 GMT

Tried your method of idling the car for about 40seconds then turning off and listening for any boiling - it works! Mine only boils/bubbles occasionally as i normally like to idle the car before turning it off just so the oil around the turbo can cool down, might have to install a turbo timer.

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (dasic1)

Wed, 03 Oct 2012 23:56:25 GMT

dwyer125

TIPSIDUECE, was it very difficult to tap into the coolant lines? Is the heater still as hot as before? Thinking I might do the same and use the heater pipes for my water to air

IMO they are a bit small for that and its also hotter up there than running them underneath the tank

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (TIPSIDUECE)

Wed, 03 Oct 2012 23:39:46 GMT

no not really, it does take longer to heat up but once it does its constantly hot. the americans ussually tapped into the hardlines in the frunk.i replaced alll my hoses with silicone so i tapped mine into the hoses that goes up into the hardlines in the frunk, chopped in the middle and used brass t-piece from bunnings.

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (dwyer125)

Wed, 03 Oct 2012 23:03:07 GMT

TIPSIDUECE, was it very difficult to tap into the coolant lines? Is the heater still as hot as before? Thinking I might do the same and use the heater pipes for my water to air

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (blacky83)

Wed, 03 Oct 2012 22:36:07 GMT

Never noticed mine doing it.

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (dasic1)

Wed, 03 Oct 2012 22:15:46 GMT

The only time Ive had mine boil was when I didnt bleed it probably just before a track day. Bleed it again after woods and never had a problem

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (TIPSIDUECE)

Wed, 03 Oct 2012 18:38:30 GMT

i have a turbo timer, and it used to bubble a lot even after idling for a while, but that was when my heater pipe was cracked /leaking. i have bypassed those lines since then/ tapped into the coolant lines for heating and re bled the system. doesnt bubble anymore even after complete shutdown ryt after a drive, i use the timer nowadays mainly after a good thrashing

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (TRD2000)

Wed, 03 Oct 2012 18:36:36 GMT

meh it boils... with the heater or the turbo timer, with a ct26 and stock manifold or the gt30 with custom manifold... it still boils.

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (dwyer125)

Wed, 03 Oct 2012 17:08:07 GMT

I am sure the majority of bubbling issues is due to a cracked heater pipe above the tank.
Radiator stop leak fixed my bubbling for a while then the crack got worse after a year and it started again. I haven't got it back together to say for sure it was this though. I have got the crack resoldered.
My theory is that when the engine is cooling down it draws in cooler water from the heater pipes pulling in air too and the path is pretty easy for the air to travel from the crack to the radiator filler. Maybe my theory is completely crazy haha, what do you guys think?

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (purple5ive)

Wed, 03 Oct 2012 15:44:41 GMT

Really - i never heard of that before
the above test is on a stock manifold, stock radiator cap, stock cooling system and hiflowed turbo. with a intercooler fan running constatntly. if thats makes any difference.
cheers

Re:Coolant boiling on Shutdown - Yes theres a way to avoid it (Reddtarga)

Wed, 03 Oct 2012 15:28:05 GMT

I think I read somewhere that the type manifold you have fitted can affect turbos bubbling on shutdown.

Coolant boiling on Shutdown - Yes theres a way to avoid it (purple5ive)

Wed, 03 Oct 2012 15:15:03 GMT

Many Turbo owners here have or has at some time experienced the coolant boiling sound when the car has been turned off...

many say its a normal occurance while others are of the opinion thats theres air in the system, it got me thinking on the weekend and i decided to do a small test that anyone can do.
Now i have never been a fan of turbo timers until i did this test on the weekend, im still not a fan of turbo timers and till this day have never had one on my MR2
but i have found that the only car imo worth having a turbo timer is the Turbo MR2, as it def stops the boiling sound when turned off if the car is allowed to idle after a decent drive.. ive done some testing and just a normal shutdown will result in coolant boiling and purging sound.. but if the car is idled and you have the heater on full blast for just a minute or so the car never makes the boiling sound.. nothing.. ( the test was done trying to mimic a turbo timer by letting the car idle for around a few minutes and then turning it off)
now im not saying that everyone should get out there and buy a turbo timer ASAP.. but am just curious wethere anyone else has any similar findings, perhaps even someone with a turbo timer thats still gets this boiling sound can maybe try runnign the heater on full blast next time and report the findings
Please feel free to discuss..

cheers