VZ overheating, and temperature going crazy.

is it leaking from the heater tap, looks like it

 

Is that green coolant ? It does look like the heater tap is leaking if that is green coolant is it the rite green stuff as only a couple green coolants that can be used in a alloytec.

 

In passing,the heater taps cost about $35 to $40 at our local spares place. Holden have them for about $48 from memory.
They all look the same, perhaps the quality is the difference?

On ebay they are cheaper
2WAY Heater TAP Valve VZ Commodore UTE Calais V6 3 6L Holden Water Valve NEW | eBay

 

did they show you where the leak was on radiator? I would like to know if i'm spending that kind of brass, hopefully all fixed now

 

thats good to hear that he was right up front about it, yeah apprentice wages are not high (mine was $125 p/w as a first year sparky) (many many moons ago) good to see all going well at present

 

Had the same problem. had small leak in heater tap. when car cools down instead of sucking coolant back from overflow tank sucked air in through heater tap and developed an airblock. I replaced radiator cap and heater tap. Cost $85.00 from holden. Drained and replaced coolant and bled system properly. no Probs since. When car overheated on the gauge it did not smell hot and a pressure test found nothing wrong. Have been told an airlock around the temp sensor will detect steam temp not water temp hence the rapid rise in temp. My car has done 215000 k's so can't complain

 

While average running temperature is about 25% it can be boiling at 30% ie not even half way on the gauge. system must be able to pressurise or it will boil

 

how many kays?
ours has got 190k i estimate probe started about 170k.

heater tap replaced, then found water pump had slow leak as did coolant cap.if radiator lasts to 250k ill be surprised also.

when the car is hot and has a small leak from the pump it dries up quick. we got away with it for 20-30k before it got bad enough. look for any green or red stains near the front of the block. changed water pump yesterday easy job.

 

oops just read.
mate u could've got the parts off ebay. all up under 200 and done it yourself with "how to" on here. hope its sorted for u now. bloody money buckets cars are!

 

VZ Calias BMW 5 speed Auto failing and cooks the radiator

if the crazy overheating started around 170K then its the auto gear box cooler system is cooking the cars radiator. Had to replace the BMW 5 speed Auto.

 

How did you determine that there was a crack in the block?

 

I mean what diagnoses was done on the car to come up with that root cause?

 

thats sounds like a pretty rare thing to happen i would think. sure its not a welsh plug or something, maybe even within the bell housing?
have u tried getting a second opinion? is ur mechanic an old school guy? alot of their diagnosis' arnt up with the modern technology, theyre still thinking of cast iron and 202'

i will add that yes im fed up with alloytecs as well, leaking this and leaking that! pissed the mrs' one off and got a mazda 3. next car will be an 8 too.

 

My experiences with the Alloytec have not been to fortunate either, although I bought the car used under warranty.

I bought my 06 VZ Executive with 144,000 kms on the clock and around two weeks later it started overheating, I took it to the dealerships mechanic and he told me that whole radiator needed replacing (which was done for free but still), then two weeks later the same thing happened and it continued to overhead but the come back down to the normal temperature range, although this time it was a faulty radiator cap!