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  1. orthas

    orthas New Member

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    Hey all vx commy here

    I have searched on here but have yet to find someone with the same problem

    I seem to lose a little bit of water from somewhere. I have to top up and bleed the cooling about every 50-100kms with around a liter of water otherwise the temp rises (mainly while idling in traffic etc) I have recently replaced the heater tap, thermostat and radiator. Also when they replaced the radiator they flushed out the system but the problem still persists. I have tried looking for a leak while the engine is running but yet to find anything. I know these vx's have a lot of common problems. hopefully someone here knows what it could be.

    Thanks
    Jeff
     
  2. _R_J_K_

    _R_J_K_ Well-Known Member

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    Intake manifold gaskets. Suuuuper common on all the V6s.
     
    losh1971 likes this.
  3. gossie

    gossie Well-Known Member

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    Water? Or green coolant?
     
  4. orthas

    orthas New Member

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    When it was flushed it was filled with coolant but now to save money I replace it with water. Can't see what and where it's leaking from
     
  5. losh1971

    losh1971 Well-Known Member

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    x2 if the manifold gaskets have never been replaced they will need to be. Given the description of the prob I'd say R_J_K is 100% on the money.
     
  6. gohrdrgomad

    gohrdrgomad Active Member

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    lt needs coolant within the system. Water isnt suitable and simply adding to what coolant is left however long ago it was added is diluting it further creating heat. It may be serging out the overflow, if it isnt functioning as per required you will always be topping up as you said in my opinion.
     
  7. losh1971

    losh1971 Well-Known Member

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    Since water transfers heat better than coolant, how can it make the engine run hotter? :confused:
     
  8. gohrdrgomad

    gohrdrgomad Active Member

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    lt boils. Time for a cuppa loshy.
     
  9. _R_J_K_

    _R_J_K_ Well-Known Member

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    Like above, it's about different boiling points. Water/coolant boils = car overheats and blows its lid, one just happens faster than the other (some coolants boil at like 130deg). Not that there's much in it, but I'd wager coolant is a better conductor for heat (particularly where industrial non-water coolant is concerned), otherwise what's the point of putting an insulator in the thing you're trying to cool if it can't exchange thermal energy through a radiator properly?

    Also, depending on where you live coolant won't freeze anywhere near as easily as water (i.e. cold night). Then there's the corrosion inhibitors they usually incorporate too.
     
    Last edited: Feb 13, 2019 at 4:49 PM
  10. losh1971

    losh1971 Well-Known Member

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    Given the above theory this suggests that the ultimate then would be straight coolant. Just because it raises the boiling point doesn't mean the engine runs cooler. I could put in enough glycol to raise the boiling point to 180deg but in doing so the engine would probably overheat.
     
  11. tml678

    tml678 Well-Known Member

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    Isn't that what the pressurised cap is designed to prevent..?
     
  12. gohrdrgomad

    gohrdrgomad Active Member

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    lts suggested 50/50 mix for optimal benifit in a application of this discription. When water boils it vapourises. Glycol may expand/ build pressure but not certain. Some materials such as aluminium require different care compared to a cast block to prevent heat sink or the effects are significant. I did read glycol can etch or deteriorate materials at a „Äč100%. Im not 100% certain that glycol doesn't evaporate but does loose its% overtime so a test kit is available to check. If mixed the water will evaporate. Some cheap s_#@ possibly deteriorates prematurely compared to the goods.
     
  13. gohrdrgomad

    gohrdrgomad Active Member

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    its to release pressure and cannot possibly prevent boiling, it just assist with circulating heat that builds pressure as the temp rises. So if water boils earlier, the steam vapours occur earlier than coolant, requiring a earlier pressure release. Therefore coolant is superior. If it fails it can pop your radiater tanks for eg:. Thats my understanding.
     
    Last edited: Feb 13, 2019 at 5:55 PM
  14. Dayvo

    Dayvo Because i can

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    Try pulling out and checking the rubber overflow hose . The one in my old vx had swollen inside the bottle and wouldn't let the coolant flow back onto the radiator.
     

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