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Thread: Auxillary cooling pump

  
  1. #1
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    deono's Avatar
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    Auxillary cooling pump

    I've been wondering for a while when this pump actually runs. I have noticed that if I turn on the A/C the engine temp drops down from 90 to 85 so I always assumed that the cooling pump only runs when the A/C is on.

    However I've read that some people say it runs after turning the car off?

    So I decided to dig around at the wiring diagrams in TIS and was surprised to see that the relay for this pump is separate and not part of the cooling module like I was expecting.
    It seems that the relay gets a signal from the ECU which is related to the A/C so it would seem my initial suspicion may be correct.

    Has anyone tested to see exactly when this pump runs?

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    davemk4coupe's Avatar
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    I think it has dual function - like you say when the aircon is on and when you switch off the car to keep the water circulating so it doesn't boil in the turbo.

    My pump was faulty and was blowing a fuse when the car was sitting there running which is why I suggest it is used when the car is running and the aircon is on.
    2006 Astra 1.9CDTi SRi

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    Well the wifes car is diffrent, as soon as you put the keys in on no.2 (red lights on dash) after about 5 seconds the pump comes on and you can hear the water and pump, and as soon as the engine is turned off the pump goes off,
    Im not sure how or when this pump should come on?
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    mine comes on when i put the key to second click. its like a hissing sound.
    www.chilled-rc.net For all your RC car/boat/heli/plane needs

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    Quote Originally Posted by spidercoupe View Post
    mine comes on when i put the key to second click. its like a hissing sound.
    same here and you can hear the water flowing, even while the engine is cold. (Thats not right)
    I think i left it once and it switch's off after about 20 mins..
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