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[duaneyb1]

Hello guys
iam still having problems i have a 3.0 v6 omega ive only had it a week.
the problem is over heating and high pressure in the header tank. the other day the pressure was so high the coolant was pushed out of the header tank with the cap on tite. The coolant hoses get rock solid and i have no thermostat
any ideas coz iam all out

[Simon72]

Sounds like a head gasket problem there.

The compression of one of the cylinders or more is pushing air into your coolant system and pressurizing it.

[duaneyb1]

that is what i thought but i had a block test done and the head gasket is fine

[markspark]

could the rad be blocked or the water pump not working correctly just a thought for you

[RobG]

that is what i thought but i had a block test done and the head gasket is fine

You must have a circulation blockage somewhere

[duaneyb1]

done a rad flush and the water pump looks new  :-/

[markspark]

when the engine is running im sure ther should be water running into the header tank the water pump maybe new but could be faulty one

[Abiton]

that is what i thought but i had a block test done and the head gasket is fine

You need to do a compression test (assuming that the 'block test' was a chemical test in the header tank- not always reliable), or a visual check to be more confident in the HG I think.

By visual check I mean taking out the spark plugs and looking into the holes  with the aid of a bright little torch, a few hours after it was last running.  If you just see nice dry piston crowns, then you can probably say the HG is OK.

Edit: Or, as above, the water pump may not be pumping, even though it looks new.

[RobG]

What did your rad flush consist of. Top hose off, bottom hose off then hosepipe jobby. If so and the rad does have a blockage the flow of water will just bypass it and exit through bottom outlet. Ideally need to use a quality descaler. Easy test for a blocked rad is to get to operating temp. then use an infrared temperature sensor to check

[tidla]

the small hose on the header tank when removed should flow when the engine is running( water pump doing its job)

second infer thermo check of rad, aluminium fins in check and not rotted away especially lower down?

[duaneyb1]

yes the block test was chemical. and the rad flush was with holts rad flush  :-/