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Thread: coolant circulation after engine stopped

  
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    coolant circulation after engine stopped

    I recall seeing something on here regarding there being a pump that pumps the coolant around the engine once it has stopped, I have had this on some of my other cars but I have never heard any noises to suggest that my GSi has this feature.
    I've just come back after 3/4 of an hour of spirited driving and still no signs of a pump running.
    I noticed this 'omission' when i first got the car and have failed to act on it, pillock.
    Any info would be appreciated.

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    The pump runs off the cambelt. No engine on no worky worky .

    Even if you fitted an inline pump as soon as it hits the impellas of the pump it will stop. Unless you run so much PSI that it cranks the entire engine over. Personally I wouldn't worry about it too much. Unless it becomes an issue. I'm sure Mr Vaux will have thought about this one.

    hope that helps
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    Hmm, I could of sworn I read summing about this issue on here saying this feature was incorporated

    On previous cars I've had, its a little electric pump that circulates the water for a while after the engines stopped to stop hotspots forming as the engine is trying to cool, these little systems are sometimes referred to as 'anti percolation pumps'

    Thanks for the reply.

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    The Z20LET does have an electric pump that keeps the water flowing but I dont think I have ever heard it either
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    Quote Originally Posted by montyfox View Post
    Hmm, I could of sworn I read summing about this issue on here saying this feature was incorporated
    like this perhaps? http://www.m1gst.com/vb/showthread.p...ric+water+pump

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    Quote Originally Posted by Ffoeg View Post
    Cheers yet again Ffoeg, thats the one that jogged my memory the other day to resolve this matter!

    So, next question. How many Zlet Chaps have actually heard their unit running on, after they have stopped their engine?

    Just wanted to get to the bottom of this as personally i feel its rather an important issue regarding engine longevity. On a couple of other cars I had, the pump would be running after any spirited driving and ultimately, I was wondering if this system fails on the Z20let.

    Maybe a poll should be started?

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    cant say ive ever heard it but also never tried to,

    but what temp does the engine have to be for it to start pumping? most of my journeys by the time i get home the engine isnt that warm,
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    Quote Originally Posted by AndyR View Post
    cant say ive ever heard it but also never tried to,

    but what temp does the engine have to be for it to start pumping? most of my journeys by the time i get home the engine isnt that warm,
    I wasn't 100% that the GSi had this system,never mind knowing at what temp its sposed to cut in, hence my thread

    Most of my driving is on free flowing roads, hardly any urban driving so it's not as if my car is going to get as hot as some others but there are times that I have had a jolly good 'play' in my Gsi and I have walked away from it hearing no sound of a little pump humming away and thinking, hmm, shouldn't there be some kind of 'cooling run on system'!

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    The Electric pumps only circulate water from top to botom of the rad, and only when the ignition is off and the Lower Fan switch is active.

    I've only seem them on V6s due to the heat soak of the huge block.
    2.0/2.2 Diesel Vectras have them too due to the hot running of Diesels.


    Omegas also use a pump to circulate water through the Heater matrix (same type of pump)
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    It can't be that crucial as the decided to remove it on the LEH.

    I've never heard mine, but that is not to say that it has never kicked in. As the fan switch has to be active, you wouldn't be able to hear it anyway!

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