VE SS Getting Hot

[HOLDAN]

Ok ran my Z till warm & recorded 96.4 @ ambient of 25.5, cracked the cap @ idle took it for a 15min stop/start run & recorded 99.7 with a little coolant streaming out of the cap. So about 3 degrees increase with press relieved.

OK Thanks for that. Mine hit 118 while backing my ski boat into the shed after towing the boat for an hour.

Today it ran 92 to 97 in the traffic.

[Micks]

Reckon you have it nailed!

[HOLDAN]

Reckon you have it nailed!

Yes I reckon I might. Taking the boat out on Saturday. We'll see what happens then before I call this busted.

[IJ.]

So what was the fix Dan?

[HOLDAN]

So what was the fix Dan?

Screwing down the radiator cap - took all my strength and then the aid of multigrips to get it screwed down all the way. I never had to use that much force before - even when the car was new. Holden told me it was because of the new o-ring in the cap....................

[IJ.]

Screwing down the radiator cap - took all my strength and then the aid of multigrips to get it screwed down all the way. I never had to use that much force before - even when the car was new. Holden told me it was because of the new o-ring in the cap....................

Very interesting thanks Dan!

[seldo]

No a loose cap will lower the system pressure & lower the temp slightly! Depends how bad it's leaking.

Are you sure mate ??? I would have thought a lower system pressure would = a lower boiling point & therefore make the engine prone to overheating.

A lower pressure will result in a lower boiling point.
Raising the pressure will just raise the point at which the coolant boils, but will not change the cooling characteristics of the coolant, nor will it reduce the overheating tendency of the engine - just delays the inevitable.
But what it will do is prevent fluid being forced out and depleted, which reduces the cooling mass of fluid

[XUV]

A lower pressure will result in a lower boiling point.
Raising the pressure will just raise the point at which the coolant boils, but will not change the cooling characteristics of the coolant, nor will it reduce the overheating tendency of the engine - just delays the inevitable.
But what it will do is prevent fluid being forced out and depleted, which reduces the cooling mass of fluid

yeah, you could look at it like if you pour water from a glass onto a hot plate it'll just boil n bubble away ,
but flip that glass of water over and force that water onto hot plate in the confines of the glass , you'll cool that spot.