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2005 VZ sv6 slight overheating issues

Discussion in 'VZ Holden Commodore (2004 - 2006)' started by jd71, Oct 11, 2018 at 10:17 AM.

  1. jd71

    jd71 New Member

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    Hi guys,

    Firstly, the number of times I've searched a problem with my car and found a link to this forum on google top result with help has been massive over the years !! So thanks to anyone that's helped people on here, google doing its job!!!

    I have a vz sv6 auto, I will drive to my mums place (50km) and it'll be fine, I will drive back a couple hours later and I stop half way at milk bar and it's getting a bit warm. I know my temp gauge and it's sitting on about two and a fraction notches, about a half a notch or a notch higher then usual. And under the bonnet you can smell that coolant/overheating smell. I let it cool down, coolant level seems ok, drive home and then on the way home the temp gos down at least a notch, hardly any smell. Checked coolant reservoir on cold car and it looks like it's over the full hole mark on stick.

    Yesterday I went into town, noticed the gauge up that little extra like before, can smell the coolant again, drove home ok, temp reduced again a little on drive home, checked coolant this morning and coolant reservoir still full or even slightly over full. Also, opened that coolant cap on the motor and seemed a bit dirty, could see a bit of coolant in there, I'm not sure if that's good or bad, in the past it's been clean in there.

    Firstly, it does need an oil change asap, could this be a reason for slight overheating? I talked to a guy at Holden shop just where I actually had parked my car and he said it's unlikely to be a oil issue, something else.

    Any advice? I am strapped for cash but the thought of losing a vehicle gives me a tumor!!!
    Could i fix the problem by going and giving it a oil change today? I'm certainly no mechanic but I've read a guide on here about changing oil, I think I'm up for that challenge. (Oil change, oil filter change) Or should I attempt flushing the coolant? I should say the radiator was replaced a couple years ago after it had a hole in it, but had no issues up u til recently.

    If you guys could give me any advice at all for some thing I might be able to do myself, or you think I should take it straight to a mechanic that would be great.

    Thanks
     
  2. greenacc

    greenacc Searching for the billion

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    When you take off the pressure cap with the engine cold is the coolant full?
    After going for a drive like to your mums have you felt if the top radiator hose has pressure in it by squeezing it? It should hold good pressure in it for about 10 minutes after you stop . That means there are no leaks that let pressure out, and the pressure cap is ok. You might just need a new pressure cap if it's been a few years and the reservoir is over full.
     
  3. rambunctious

    rambunctious Well-Known Member

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    Remove the drivers side engine cover (lifts up and off) and check the heater tap for leaks.
    That is interesting cause with my vz I can unscrew the pressure cap on the engine and no pressure straight after an hours drive., and still full at the cap, however the radiator and cap are reasonably new, as is the heater tap.
     
  4. greenacc

    greenacc Searching for the billion

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    You have a problem if you can do that without coolant spraying everywhere and burning you!
    I suggest using a genuine cap from Holden on these cars, the supercheap, Repco, CPC, Tridon etc don't work.
     
  5. jd71

    jd71 New Member

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    No it's not full at all, i feel like a tard lol, the coolant reservoir seems over the plastic dipstick? Should i top up under presuure cap with water or mixed coolant? And top it right up to brim?
     
  6. 99notout

    99notout Active Member

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    You should top it up under the pressure cap (don't open it when it's hot or under pressure), clamp the expansion tank hose closed, with the radiator bleed screw out ( top of the radiator battery side) and fill it until it at least runs out from there, then screw the bleed screw closed, and top up until the filler neck under the pressure cap is full. Then run your car in the driveway with the cap off until its hot and undo the bleed screw and do it all again. Remember to do up the bleed screw and remove the clamp from the expansion hose.

    But if you have any leaks anywhere (heater tap is really common, along with cracked radiator) then you will keep sucking in air, so fix these first.
     
  7. jd71

    jd71 New Member

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    That sounds pretty complicated for me to do, is it very hard?, Ive seen videos of similar things where they put the heater on while they do it? When I got the radiator fixed a couple years ago the mechanic was just topping it right up at the pressure cap, and told me to keep doing it for a couple days. Would something bad happen if I just topped that pressure cap with spring water?
    I keep trying to check the reservoir, it would help if I could even see the sides of it but they make it so hard, took that massive piece of plastic above the radiator off, do you even need that? Is it just to stop junk dropping down there? What if it needs a new air filter, could that make it get warm?
     
  8. jd71

    jd71 New Member

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  9. jd71

    jd71 New Member

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  10. jd71

    jd71 New Member

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    is this video ok to follow? DO I just buy some already diluted coolant to top it up?
     
  11. jd71

    jd71 New Member

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    ok, I think Im confident enough to do it, just not sure whether to empty the coolant thats in it first or just top up, anyone?
     
  12. greenacc

    greenacc Searching for the billion

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    Just depends how much you want to spend.
    Topping it up at the pressure cap like your mechanic said is a good place to start then bleed air with the screw. It should always be full up to the pressure cap. Still sounds like you need a new cap to me to stop it all ending up in the reservoir unless it's leaking somewhere else and you've been filling the reservoir rather than the pressure cap? ( you should try to get both at the right levels).
    The red 50/50 mixed coolants are the easiest to use like the Nulon one, assuming your mechanic hasn't put green in it? They go on sale quite often.
     
  13. jd71

    jd71 New Member

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    Hi, thanks for the comment!! It's got red in it now, I live outside of city are and the servos here only have some crappy blue stuff so I'll have to drive to supercheap or autobarn, he probably didnt even bleed it, I read on here that a lot of mechanics dont think you need to. Is it beneficial to empty the old coolant from radiator or will I just top up with new red coolant,. and just need to know if I have to get nulan coolant or i can get a cheaper one they have, auto barn have a special still on so i may just get the nulan one. And I have to get distilled water? spring water no good from aldi?
     
    Last edited: Oct 11, 2018 at 5:24 PM
  14. greenacc

    greenacc Searching for the billion

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    Well Nulon and most of the other brands have 2 types of red coolant. The concentrated one and the premixed one. If your just doing top ups it's easier to use the premix and just pour it in, you don't need to mix it with distilled water.
     
  15. jd71

    jd71 New Member

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    THANKS MAN, should be ok for the commodore yeh? just bleed it with the screw on radiator and heater on?
     
  16. greenacc

    greenacc Searching for the billion

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    Yep, you can look up the Nulon or Penrite or whatever website to see what they recommend for your car but that should be it. Who knows what your mechanic used.
     
  17. jd71

    jd71 New Member

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  18. scaredyet

    scaredyet Member

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    I wrote the same issue last week and only got two replies let's try and fix it together
     
  19. greenacc

    greenacc Searching for the billion

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  20. jd71

    jd71 New Member

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