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2005 VZ sv6 slight overheating issues

Discussion in 'VZ Holden Commodore (2004 - 2006)' started by jd71, Oct 11, 2018.

  1. jd71

    jd71 New Member

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    can i leave that huge plastic cover off above the radiator?
     
  2. rambunctious

    rambunctious Well-Known Member

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    Leave it off if you like.
    It is there to stop you losing fingers and hands while the engine is running.
    It may also assist air flow through the radiator and around the engine, not sure.
     
  3. jd71

    jd71 New Member

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    DOES IT MATTER IF i put some water in the radiator until I get some coolant, like 600mls via the pressure cap??
     
  4. 99notout

    99notout Active Member

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    Better than nothing!
     
  5. jd71

    jd71 New Member

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    oh goo
    thanks yeh!
     
  6. jd71

    jd71 New Member

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    It only took about 100 mls of water before it was full under the pressure cap, do you think I should get a new cap? Ive heard this fix peoples problems??
     
  7. greenacc

    greenacc Searching for the billion

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    Check if yours is holding pressure first. If it doesn't then get a cap
     
  8. jd71

    jd71 New Member

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    I bought one because I took mine out and had a close look and its pretty worn with fine cracks along the outside of the seal, and Ive read on here that it fixes many problems so for 16 buck I thought Id give it a try. So if it still gets warm, do you think I should completely empty the sealant and put fresh sealant in? I wasnt sure whether to get the small 1 litre top up bottle at autobarn or the big 5 litre one? And do you know when you fill up new coolant, how do you get rid of the existing coolant in the coolant reservoir? I know theres a tap for the radiator, not for the cooling area though, not sure though.
     
  9. greenacc

    greenacc Searching for the billion

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    The age of the coolant won't cause it to get hot so replacing it won't fix your problem. Just work out if it's building up and holding pressure with the new cap first. Also check everywhere you can see for red leaks.
    If it holds pressure and isn't blocked it should cool fine
     
  10. jd71

    jd71 New Member

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    so the motor is still hot (top of it), and the radiator pipe under the pressure cap still hot, hot enough for me not to hold my hand on it longer then 20 seconds. This is 2 hours after I took it up the street 5 minutes away and before then I went into town about 40 minutes return. How hot do these motors get? Trying to work out what is normal? but the temp gauge didnt get past two notches today to go and grab the new cap.
     
  11. jd71

    jd71 New Member

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    how do I see if it's holding pressure? If there were leaks wouldnt all the coolant be gone? I didnt use much water to top it right up today, like couple hundred mills and the coolant reservoir is over full.
     
  12. greenacc

    greenacc Searching for the billion

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    So after driving for 10minutes or more the coolant should be hot enough to build up pressure in the cooling system. You can easily feel roughly how much pressure you have by squeezing the top radiator hose. When it's cold it should be very soft. When it's been driving for a while and warmed up it should be firm like a tennis ball.
    Once you switch the engine off the pressure will slowly drop over about 15 minutes til the hose is soft again.
    Keep your fingers away from moving parts while checking!
     
  13. jd71

    jd71 New Member

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    ok thanks I'll check it in the morning
     
  14. jd71

    jd71 New Member

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    Im not even confident the cap is the right one, there was two on his computer at autobarn and he couldnt even confirm which one matched my vin, it screws on and looks like the old one so just try it I guess
     
  15. jd71

    jd71 New Member

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    .....
     
    Last edited: Oct 13, 2018 at 12:24 PM
  16. jd71

    jd71 New Member

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    new cap didnt do anything. Worked out how to turn on diganostics, gos from 60 to 70 to 90 pretty fast, takes a long time to cool down, still doesnt go over two and a bit notches on the dial. The fan isnt kicking in, when is that supposed to kick in? Could it be air in the system, could a top up and air bleed fix it or something worse? Could it be because it needs fresh oil? Couldnt seem to feel that much pressure difference when I squeeze that radiator pipe from the radiator to the pressure cap.
     
  17. stick3

    stick3 Active Member

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    i found this youtube vid where a bloke changes the thermostat from the rear without removing the tranny its a PIA job
     
  18. jd71

    jd71 New Member

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    yeh im not doing that ha, I;ll change the oil, bleed it and see what happens I guess, cars probably stuffed
     
  19. greenacc

    greenacc Searching for the billion

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    I've tried 2 of those aftermarket pressure caps and neither worked properly just like what you've found. I've stopped using them now and only buy caps at Holden.
    Fans normally come on around half way in the temp gauge.
     
  20. DeanoV6

    DeanoV6 Member

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    Fans come on at 108 deg. Yip they run hot ! 95 to 105 normally
     

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