STILL overheating

[PaRaDoX]

hey, im stumped.... for around 6 months my cooling system has done nothing but pressureise and boil over... now ive replaced the headgaskets, inlet seals overflow tank, thermostat (180deg) but it still does it...

im at the point where i dont run coolant because if i do it pisses it out within a week, the pressure makes holes where there is no holes.. im stumped any idea's???

[azkwazere]

youve given it a really good flush yeah?

aZk.

[AirStrike]

Get it flushed professionally and pressure tested. The bloke I use charges $88 to flush, fill and pressure test.
AirStrike

[SthEastCustoms]

upgrade thermo fans to a 16" and service the radiator, a recoer might be an option or adding another core

[PaRaDoX]

youve given it a really good flush yeah?

aZk.

yeah on more than one occasion, radiator flows good, i need to check all my piping tommorrow make sure its all fine, problem probbly lies there and ill throw some coolant in it this time since the engines backtogether

went out for a cruize, more water in it, temp held steady musta been air in the coolant or a leak somewhere cuz there wasnt much coolant left...

[stmcomms]

Water pump? Can make a big differance !

[PaRaDoX]

water pump looks new

[defa]

if it is a series 1, take your time putting water in it. it takes a while to get all the air out of them..

[88GreenVN]

Have your heater set to flat out when you fill her up!

[AirStrike]

water pump looks new

Please tell me you had it off and inspected it and are not just referring to the appearance of the casing.
AirStrike

[PaRaDoX]

i had it off i had everything off.. and as far as i can tell now its got to do with the thermostat piping, i think it has a split in the end, ill replace it

[xcop5l]

it will most likley be a blocked radator or alot of air in the system.
you may think your radator is flowing good but it may only be using half of it

[holden007]

Check if the water pump is leaking, dont look at the casing as you never know, holden pumps are crap, like power steering and fuel pump, they dont last long.

[danielsan]

and as far as i can tell now its got to do with the thermostat piping,

haha thats what mine had a couple of weeks back

[88GreenVN]

Have your heater set to flat out when you fill her up!

Should add Have your heater set to flat out when you fill her up with coolant to stop air locks

[PaRaDoX]

well its been fine lately, havnt driven it much tho... dont drive to work anymore (working in the city these days) sooo shes a weekend car now

[PaRaDoX]

popped a hose found it :P forgot to tighten clamp

[savage1987]

lol that's always embarrassing!!
I did that with the high-pressure power steering hose after changing the pump!! Things got messy real quick . . . so much for all the time I spent cleaning the bay . . . . *cries*
Drive ... drive ... turn * hiss * *steam fills cabin* 'oh no!' *pops bonnet* *steam clears* FLUID EVERYWHERE!!
*speechless, sits down resting against the car*

[PaRaDoX]

HAHAHAHHAHA... ive got a good 2L of power steering fluid still in my drive way... lost the seal for the overflow tank... it leaked EVERYWHERE

[savage1987]

yay! I'm not the only one who's done something dumb with their power steering!! *yay*

here's what the carpark looked like after mine:

[car]........ .... .... .. . ... . . . . . . . . . <-- p.s. fluid ... lol

But she's got a new high-pressure hose now and is on the way to a new rack as well (just starting to leak) so all is good

[crocko_05]

it will most likley be a blocked radator or alot of air in the system.
you may think your radator is flowing good but it may only be using half of it

Be sure to read w/shop manual regarding refilling and bleeding cooling system.
THIS IS VERY IMPORTANT!!!!!!! There is an air-bleed screw in system to bleed out air (as on VL6 as well).

[Nikkojoe]

Be sure to read w/shop manual regarding refilling and bleeding cooling system.
THIS IS VERY IMPORTANT!!!!!!! There is an air-bleed screw in system to bleed out air (as on VL6 as well).

Im assuming its a S1 vn so it does not have an air-bleed screw.

It's mostlikely a blocked radiator or your new thermostat is a dud (and yes, they do happen - my genuine holden thermostat I got was a dud, got a repco one and now works fine).

I would be constantly checking both radiator hoses are getting hot and are firm to touch (shows good system pressure). When the car is warming up, the top hose should get hot by the time it reaches the first notch above cold. If the radiator is flowing properly, bottom hose should be about the same temperature....

Also make sure coolant level is good as its hard to tell how much is actually in the system...