Expansion tank overflow

[Chrishoughton1989]

Hi my exspansion tank overflowed today after driving hard for a long period. It was at the full mark to start. I'm hoping there was to much water in to start is this possible causing it to overflow. Should I drop it down to min mark ? Has anyone else had this ? Thanks.

[Chrishoughton1989]

Anyone ? Does water being drawn back from expansion tank make a sort of glugging noise and u can feel it if you touch the expansion tank? Or is that water boiling ? Thanks

[TurboTobz]

Could be an air lock, too much water possibly, headgasket, cracked head.

Check the usuals, pressurising coolant system, gunk under oil cap, petrol smell in coolant etc etc

[Chrishoughton1989]

None of the above ? Can you hear the water like gulping back into the rad after you have switched engine off ?

[TurboTobz]

Blockage? Sounds like some form of air lock or some pressurising although obviously you say not, sounds like something's pressurising it out of the rad and once engines off its allowing it back in.

Temperature staying the same?

[Chrishoughton1989]

Is that not normal. After hard drive it pushes it out than draws it back in ? Just can you hear it drawing back ?

Temp normal.

[TurboTobz]

Well as things heat up then it will push out some, and then draw it back in m. I was under the impression it was rather a lot?

[LukeH]

I have the same problem. Overflows then once cold is back down to min, so I have to top it back up. Only after hard driving.

Just had new head inc gasket, thermo ect. Running civic rad, could it be that the cap is simply not holding the pressure?

[Bluebear]

I'm having this exact problem, got myself a 1.3 bar radcap on the way and hopefully that'll solve it. Any airlocks should have been well gone by now, and I don't think the rad itself is cracked.

[TurboTobz]

Ah yes, I did forget the rad cap

[Chrishoughton1989]

I'm running civic rad 1.3 cap still the same. Head gasket done last month. New civic rad. New cap. Tested thermo. Glad it's not just me lol

[Mad Mike EP82]

I've had same problem will let u know when the head comes off.

[The Toffinator]

I was having this problem before my engine did this

Not too scare anyone lol.

Never got to the bottom off it but im sure it only started doing it after i fitted a civic rad etc....

[Chesh]

Change your rad cap if it does it then just flush the system, When you say it does it on hard boost it could be the head lifting on boost, Who did the headgasket for you, try new theromstat that might be sticking

Edited September 4, 2013 by Chesh

[LukeH]

Im guna try a rad cap, seems logical. Do starlets one fit the civic rad?

Let us know how yours does nick (bluebear)

Chesh: i did mine. New arp bolts. Got someone to double check tourque so pretty sure its not that. Only running 0.8 bar on ct9

TOffinator. Thanks for filling us full of confidence lol

Edited September 4, 2013 by LukeH

[Chrishoughton1989]

I dropped the water from max to min in the expansion tank when cold and it's fine now was obviously over filled.