Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

VZ running hot every trip

exanVZ

Active Member
Joined
Feb 20, 2011
Messages
242
Reaction score
32
Points
28
Location
Perth
Members Ride
VZ Thunder
Hey guys,

I'm new around here so hi to everyone :) I've had my license about 6 months and bought a VZ as my first car. It's been great since I got it, loving the car, but in the last week or so I've run into a problem. After a few minutes of driving the temp gauge slowly climbs and will get all the way up to H if I don't stop or turn the heater on to draw out some hot air. I've checked oil and cooland which both seem to be full, and were checked last service (a few months ago).

I've read the below thread (didn't want to make my first post a necro post) and think that this might be the problem, either radiator cap or thermo.
http://forums.justcommodores.com.au...628-vz-v6-running-hot-no-apparent-reason.html

I will try a new radiator cap tomorrow and see if that fixes it, I am sure I will be able to figure that out. Any other suggestions (before taking it to get it looked at)?

Not knowing much about engines, but wanting to learn how to take care of this car for many more years, any suggestions on where to start? Would also like to look at some minor upgrades like aftermarket filters such, but really just don't know where to start learning. I am very good with computers and electronics and can usually figure out how something works by looking at it or by taking it apart, however, not something I am keen to do to the car! Any ideas let me know :)

Cheers,

Patrick
 

Big Red VF-SII Go-kart

I love puddles.
Joined
Aug 3, 2010
Messages
1,166
Reaction score
385
Points
83
Location
Darwin NT
Members Ride
VFII MY17 SV6 (LFX) Sportwagon (SOLD)
Patrick, I'm sure you'll learn a lot of great interest from the JC community here, and particularly the VZ model.

But the first rule of thumb is not to play with the electronics: the VZ literally bristles with sensors that continuously feed electronics (two computers control the circus: body control module and engine control module). Great stuff for the electronically well-endowed; otherwise steer clear.

When something needs attention, the VZ-series will display an error code (Pxxxx); if the engine requires an unscheduled service somewhere, it will display a spanner and Service Vehicle Soon (abbreviated to SVS display when the message is cleared with Mode if it annoys you!) . A programmed scheduled service interval would display as 10,000km service due (set by the techies after service). Lots of other things to learn and of course trawling through the JC forum will doubtless stoke your enthusiasm, but temper it with caution: you'll also find how people have a lot of strife!! ;)

I would suspect a faulty radiator cap as the first culprit worth looking at. If the hot condition persists, an investigation of the thermostat would be in order, plus the temperature sender. Also check the coolant reservoir level (that's the right side yellow cap at right of radiator/engine cowling on VZ engine bay) Though never experienced it myself, apparently the VZ can log a fault or trouble code regarding the high temperature situation and this can be interrogated by a Holden techie (yes, yes, often at ridiculous cost, so leave it out of preliminary searches!).

The subject of aftermarket filters is a bit of a bone of contention: Holden (and several well-research websites) will tell you they make no difference; others including the manufacturers will swear absolutely by them with often promising but largely unsubstantiated (given a huge number of variables) claims. I personally view some of the claims regarding aftermarket filters with great suspicion built on many years experience in driving very long distances and extensive servicing. Others here I'm sure will differ, and I respect that. Note that some oil-impregnated filters, often quoted as performance-enhancing/economy enhancing, can bleed oil onto the MAF sensor just before the filterbox; when this happens, erratic or retarded engine behaviour may result as the MAF sensor is sensitive to any type of surface soiling e.g. dust, oil, etc. (the MAF — mass airflow sensor — is a frail vertical wire that detects the amount and velocity of air entering the manifold snorkel from above the air filter and the information it gathers is interpolated by the engine electronics to adjust fuel-air mixture and throttle response, among other functions. BTW, don't touch it with your paws!!).

Something to get you started. For this poster, something down in the garage now needs to be started and taken for a spin, for every VZ likes to be used, of course! :p
 
Last edited:

exanVZ

Active Member
Joined
Feb 20, 2011
Messages
242
Reaction score
32
Points
28
Location
Perth
Members Ride
VZ Thunder
Thanks for the reply Little Red VZ, I'm not talking about doing anything drastic, just slowly starting to get my own hands dirty.

I've found this guide to flush out the cooling system, if changing the radiator cap doesn't do anything, I was considering giving this a go. Looks fairly easy to follow, although it is a different model shown, is the VZ much different? If I follow this as closely as possible would I get stuck anywhere where the VZ is significantly different?
https://forums.justcommodores.com.au/threads/how-flush-v6-cooling-system.28762
 

richardpalinkas

Blown Alloytec
Joined
May 4, 2009
Messages
2,290
Reaction score
14
Points
38
Location
Gold Coast
Members Ride
Raptor Impulse VZ SV6
same as above, check radiator cap and if not, the thermostat.

regarding filters etc. just buy a k&n, it will last the life of your car so it saves money there, just make sure that when u oil it up, let it sit on some abforbant towls or newspaper to absorb the excess overnight, that way you should not have problems with too much oil on the maf.

also, if you are looking for a little 'deeper' induction note, buy a 90mm pvc pipe and do a 2 hole mod, just search and you will find the answers. its easy and has a nice induction noise and possibly one of the best air inductions you can do, and with the price of it (<$5), its not money wasted lol. obviously there are other options like MACE and SS Inductions, but a lot of people swear by the 2 hole mod
 

exanVZ

Active Member
Joined
Feb 20, 2011
Messages
242
Reaction score
32
Points
28
Location
Perth
Members Ride
VZ Thunder
Thanks for your reply too richardpalinkas, hard to get back to people when I have to wait on posts to be moderator approved, but thats hopefully just because I'm new.

Edit: Found this guide for the '2 hole' mod, looks pretty easy to follow and good pics!
http://swingtan.customer.netspace.net.au/2hole.html

Anyone else, keep the links or info coming and I will be sure to read it.

Cheers,

Patrick
 
Last edited:

Big Red VF-SII Go-kart

I love puddles.
Joined
Aug 3, 2010
Messages
1,166
Reaction score
385
Points
83
Location
Darwin NT
Members Ride
VFII MY17 SV6 (LFX) Sportwagon (SOLD)
A bleeding procedure (to expel air) must be followed for the VZ engine; if this is not done airlock can stop the free flow of coolant throughout the engine.
 

exanVZ

Active Member
Joined
Feb 20, 2011
Messages
242
Reaction score
32
Points
28
Location
Perth
Members Ride
VZ Thunder
Hey guys thansks for the advice so far.

I went to supercheap after work to try and get a new radiator cap (as didn't get a chance on sunday) and the guy looked up my car and gave me a small stainless steel cap. Didn't look right but he said its what the book says and I can bring it back if its wrong and it was. Checked the engine to find a plastic screw on type. Going to have to go back tomorrow, but I hate driving around right now the way things are. I have to have the heater on full blast to keep the engine at about 80% heat. Doesn't get much hotter with the heater on max and if I stop driving temps quickly drop so I hope thats a good sign? Really sucks not having air con lately tho.

Can someone give me a run down on how to check the fluid levels in the cooling system, the only thing I know how to check is the coolant next to the air filter with the yellow cap and a dipstick, which is at 'max'? Also checked oil which is fine too. Is there anything else to check as I have read people check it by the radiator cap and top it up that way too... but how do I tell how much is in there without a dipstick? Please forgive this if its a stupid question as I don't know much about cars and this is my first. I don't have any mates into cars or a dad to ask or anything, so I am kind of on my own here. I would also like to know how to get into diagnostic mode on my cars computer? I've read that you can monitor coolant temps and such which might help diagnose the problem further. Just a link or something to some common commands would be good.

EDIT: Answered my own question about the disgnostic mode (doesn't seem to be in the cars book tho?)
"Put the key in the ignition, hold down the mode and set buttons, and turn your key to the "on" position."
Will see what this tells me on the way home from work today (less than 10 mins drive so doesn't usually get too hot, but can take it for a spin a little longer to find out!

I also got some pvc pipe today to do the 2 hole mod with MCAI on the weekend, it is so well documented even a noob like me feels confident doing it.

Will also upload pics of my car on the weekend (after a wash) as I know thats what u guys like to see. Right now its pretty stock standard except for 18's and a stereo (first port of call for me when I bought it.)

Thanks in advance.

Cheers,

Patrick
 
Last edited:

Luke52

New Member
Joined
Sep 10, 2010
Messages
185
Reaction score
10
Points
0
Age
29
Location
Mulgrave, VIC.
Members Ride
'07 VZ Acclaim wagon.
lol, Supercheap.

What year is your VZ?

Most VZs have a bottle-type cap which is a regular type with a spring and round metal plate with a rubber seal on the bottom. Part number for this cap is 570-120. CPC make it, so you should be able to get it from most, if not all, Repco/Supercheap stores.

Later models had a different screw-type cap, which can only be bought genuine. GM part number for it is GM92068250.

Hopefully this saves you some trouble with incompetent SuperCheap employees. The person you dealt with mustn't have been looking at the right car, because I know for a fact that the CPC caps book has the 570-120 cap listed for a VZ V6. Trust me, not only do I work at a parts store, I've also had the joys of tracking down a new radiator cap for my VZ as well.
 

exanVZ

Active Member
Joined
Feb 20, 2011
Messages
242
Reaction score
32
Points
28
Location
Perth
Members Ride
VZ Thunder
Thanks for the info Luke, it's an 04 VZ so what you've suggested seems right (after having looked at it yesterday) will be sure to get the right part this time.

EDIT: ok got one today from repco, the part numbers a bit different (repco brand, repackaged? looks identical) part# RC94-120
the one i got yesterday is part# 538/20 so who knows where that came from? I guess its my own fault for being dumb enough to trust the guy there.

Will report back once the engine is cool enough to change it and see if it helps.

Also ordered a MCAI for 2 hole mod, still $20 from holden dealer (metro in morley - they got lots).

Cheers,

Patrick
 
Last edited:

Luke52

New Member
Joined
Sep 10, 2010
Messages
185
Reaction score
10
Points
0
Age
29
Location
Mulgrave, VIC.
Members Ride
'07 VZ Acclaim wagon.
Bingo, Repco alternative is the RC94-120 (I work at Repco) ;)
 
Top