Right water light kept coming on and water was low noticed water around the tank so bought a new tank and it's happening again but a little worse and noticing water in the same place so when I took the cap off water sprayed out from the catch pictured below???

Looks like a leak off, incase header tank gets too full when up to temperature

The system is pressurised, so unless the car has had a long time to cool down then pressure will be released when the cap is opened, the hotter the engine, the more pressure is contained. Too much pressure could be the result of head gasket issues or something else causing excess air to get into the cooling system.

I fitted a new expansion bottle yesterday and got some g13 in where the threads of the cap screw into, when I screwed the cap in it displaced the fluid out of that wee channel. Hoping this solves my slight coolant loss I've been having. Don't have any traces of it leaking anywhere

The temp gauge is perfect .. After about 2/3 days the water light comes on and it's below minimum and water seems to be on the expansion tank as it it leaking from the tank??

Try a new cap, sounds like as the pressure builds its leaking past the cap? Sometimes over time the caps can failure.

Try a new cap, sounds like as the pressure builds its leaking past the cap? Sometimes over time the caps can failure.

Had 2 new tanks that came with caps same problem on all 3 so but of a mistery as temp gauge sits right no issues with running apart from the water leaking out from seems to be the tank.

I havnt noticed any leakages in the hose at the top so stuck on this one

The system is pressurised, so unless the car has had a long time to cool down then pressure will be released when the cap is opened, the hotter the engine, the more pressure is contained. Too much pressure could be the result of head gasket issues or something else causing excess air to get into the cooling system.

+1

+1

If it was hg surely temp would go up??

Also where would excess come from as if it was getting excess air surely coolant would leak from there aswell?

But its only coming from header tank very very strange this one lol

Seems to be a lot of common faults with v1 fabias I've noticed thru people's posts

:)

I'm sure it's nothing bad fingers crossed but loads of little things end up taking up time and adding up to a lot of money but hey ho another thing to the list haha

Mine done the exact thing. Take it for a nice drive Leave it over night and undo the cap in the morning. If it hisses lots then, then it's more than likely the head gasket. I had the exact problem. Done sniff test pressure test and all came back fine. Changed the the head gasket and nearly 10k miles later all is good.

Mine only done it under boost. If I was driving round town it wasent so bad. But in the motorway run that's when I got problems.

I had this issue after changing the temp sender. Was getting air in the system. I repleced the rubber o- ring and all is well now fingers crossed. The coolant level stays the same hot or cold, worth checking.

The rubber o-ring on the expansion cap?

I'll try that hope it isn't hg just find it strange how it doesn't overheat

What to remember is the temp gauge in these cars are lazy. I think it was jason with the fabia mongrel said he recorded between 75-108 on a different gauge without the OEM one moving. Not sure if it was jason but I'm quite sure I've read it here. Mine never overheated to my knowledge but the HG was foooked.

Edited 3 December, 201213 yr by danny6189

What's the best way to check hg on these if sniff test is no good?

Use some leak detection fluid for diesel combustion in the right kit. http://www.ebay.co.u...=item337d64ea3c Essentially you suck the gas from the header tank through this stuff while running the engine. If there's diesel exhaust gasses in it you get a colour change.

Head gasket failure, in this case from cylinder into waterway, blows combustion gas at peak combustion pressure (boost/high revs) into the coolant. Why should this make it overheat. The air/fuel mix is still burning at the programmed ratio/mix so no extra heat produced. OK, eventually after sufficient coolant is lost the cooling may become inefficient and the temp gauge climb but if the cooling system could cope before the leak it will cope after till it is low on coolant.

is coolant returning to the header tank from the top pipe? if not could be waterpump failing. thermostat stuck closed

if it is it could be air lock somewhere, head gasket, cracked cylinder head. also seen leaky radiators causing the cooling system to pressurise

Happened to me was water pump slight leak and early stages head gasket! When I put the foot down I got a 60 second blast of cold air through the heaters when they were turned up full heat !

Head lift.

Headlift x2

+3

If your car is a BLT engine check the EGR cooler these have a tendency to leak coolant internally when old