over pressurising cooling system.

[colegate98]

hey all i own a 1998 gu patrol with the 2.8 turbo diesel. i have the problem of the cooling system pressurising way to much and spitting all the coolant out of the over flow and eventually getting to low that it starts to get hot. just wondering if any of you guys have had this problem and if so what was the cause?

cheers ashley

[big_fletch]

Howdy mate, welcome to the forum.. People will be more Likly to help if you post up a introduction before asking questions, just as a courtesy to the other members..
I'm sure someone will be along soon to help you out, enjoy the forum.

Fletcha

[Nobby]

I had a 2.8 turbo in a gq wagon and had similar pressurisation. worked out that the head gasket had blown.
might be worth while getting it checked out.
had to get head machined and hardness tested and put back together.

[timbar]

I had a 2.8 turbo in a gq wagon and had similar pressurisation. worked out that the head gasket had blown.
might be worth while getting it checked out.
had to get head machined and hardness tested and put back together.

look for bubles in the radiator with the cap off if it blows bubbles get it checked

[colegate98]

ok sounds good im an apprentice mechanic so ill get one of the guys at work to give me a hand with it.hoping its just the gasket and there no cracks.

cheers for the response

[_Greg]

There are generally two problems that cause this issue.
- if you have a cracked head or blown head gasket, then you will see bubles comming out of your overflow bottle. also smell it, does it smell like exhaust?
- if you have a blown oil cooler (lower drivers side of the engine), then you will have oil in your water

[T0nka]

yep cracked head.

typical from a 2.8. i should know

[beansathome]

just an idea but have u checkd the radiator cap ? it could b that simple

[nemo]

as above, try a new radiator cap, try the simple stuff first no point just jumping in and pulling the head without good reason to.

Also a pressure test of the cooling system should show up a head gasket/ head issue

[_Greg]

generally when they go, they are very obvious to diagnose. When mine cracked, it blew all of the coolant out of the engine immediately. luckyly i had a couple of 20l drums of water in the back of the car and was able to limp it slowly back to civilisation leaving the cap off the overflow bottle so it would slowly gurgle in there and not loose too much water.

you can smell the exhaust fumes in the overflow bottle when this happens.