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[chrisgixer]

Another tuppence.

A pressure test won't show bubbles in the coolant bottle if the hg has failed externally, as Mark describes on the omega 98 3.0 litre for example. It will, however, show coolant leaking from behind pot 6 as said.

Iirc the 3.0 hg is a composite type with metal fire rings around the bore. Obviously the metal fire rings will be last to corrode, so the composite fails.... Externally.

Therefor, you won't see bubbles in the coolant bottle. Only if the fire rings fail.




Obviously the superior 3.2 has a metal hg.

[flyer 0712]

I use to sell lots of these and majority used on header tanks like the Omega....designed to sniff the gasses if any that are escaping into the cooling system and if so the fluid will change colour....silly i know but once the fluid is used for testing,,,do not return it into the bottle.........a very similar test can be carried out by holding the wand on the emissions tester over the aperture of the header tank at that will give a reading on the scale if leaking.although the fluid test is better