Total mystery... a leaky one..

[Librapt]

Hi guys

So, had the Jag a good few months now, LOVE the car but had a couple of issues with the coolant system. It basically dumped all the water on the motorway after building up too much pressure, this was AFTER a wrongly diagnosed expansion tank problem which we replaced, we also did the water pump as this was leaking slightly too. All under warranty luckily

Anyway, we had the heating valve replaced, radiator replaced as it was knackered AND the thermostat again, under warranty.

All was well for a week or two and now the coolant cap seems to be spitting out water... awesome... I will obviously replace the cap (again) but is this something anyone can shed some light on?

oh and we have had head gasket tests done numerous times...

Thanks

[JOE-DOT-COM]

Hi Sam

sounds like head gasket to me, but you had that tested

on what engine is it by the way

I would try a compression test, see if all the cylinders have the same compression

usually if its not head gasket then its a blockage, radiator or stat stuck, but yours are all new

also when you turn engine off do you get any gurgling from engine water system, headgasket sign

cheers

joe

 

[Librapt]

Thanks for the reply Joe it's a 2004 2.5 litre

It is an odd one, no gurgling noises from what I hear but i'll keep an ear out for it. The pressure in the system this morning was normal when I opened the expansion whereas previously even when cold the pressure was up. This was before the work completed obviously.

Good call re the compression test, we did have a coil replaced so maybe this could indicate others are on their way out? i'm not sure if that will make a difference or not i'm not very techie...

Can the cap leak when the pressure is up? it is new but from what I understand they aren't the best and most reliable caps in the world

Thanks matey

 

[JOE-DOT-COM]

hi

the other thing you need check is make sure theres no air locks in the system

not sure how you check on the 2.5

the caps are designed to vent at a certain pressure

cheers

joe

[Old_Growler]

On 2/25/2016 at 8:21 AM, Librapt said:

Thanks for the reply Joe it's a 2004 2.5 litre

It is an odd one, no gurgling noises from what I hear but i'll keep an ear out for it. The pressure in the system this morning was normal when I opened the expansion whereas previously even when cold the pressure was up. This was before the work completed obviously.

Good call re the compression test, we did have a coil replaced so maybe this could indicate others are on their way out? i'm not sure if that will make a difference or not i'm not very techie...

Can the cap leak when the pressure is up? it is new but from what I understand they aren't the best and most reliable caps in the world

Thanks matey

 

Cooling fan working + still has its blades?

[Librapt]

Hi Paul

I believe so yes, i'll have a good look though, there's been no overheating or anything on long runs, new cap arrived today so i'll let you know how it goes. Thanks for all the input guys