HELP! Pressure in the cooling system

[SonnyRoby]

It's a xud9 ph2 with big hybrid turbo, fmic, 11mm head, oil cooler. Changed few headgaskets, new head and skimmed and everything. The temp stays at 80 degrees. After a bit of coaling, the coolant level light comes on while running slowly at 2000rpms, a bit of revving and the light goes off. There's water coming out from the coolant reservoir cap. Could it be the cap that makes such a huge difference in letting the pressure out of the system?

[CJ_Derv]

Has it been bled properly? Sometimes cap can let coolant out, as they do have a little pressure as coolant is mixed with water which naturally expands with heat, also is the heaters hot? I replaced a few head gaskets on blaze and found the matrix was blocked and caused each gasket to blow due to bad circulation

[SonnyRoby]

It's been properly beld. Heaters hot and the heater matrix is conected.

[devils_fuel]

have you pressure tested the cap to see if its holding pressure or just letting water out after its expanded? Might be worth a few £'s to buy anew cap ??

[Piggy]

sounds like one of three things...

air lock
rad cap
water pump internal failure

[SonnyRoby]

Looks like its the head gasket again. I think the head wasn't skimmed well so doing it again.

[Piggy]

just an fyi...

a friend had similar issue with a xud xantia...turned out to be the head...there was a run of dodgy heads...get it pressure tested

[CJ_Derv]

Did you have it pressure tested last time you did the head a lot of people try to save money by leaving this important process

[SonnyRoby]

So it actually was the head. It was blowing through the pre-chambers. Now is runing fine. Had some problems with a stuck injector.

http://www.youtube.com/watch?v=pWOJvmVhF...e=youtu.be