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A3 2.0tdi water pump

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Lemon S3, Apr 17, 2012.

  1. Lemon S3
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    Lemon S3 Alex

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    My friend is changing his cam belt and thought he'd do the water pump while he's there. He's read some where that you need to pressurise the water system and keep it pressurised. Is this true and how are you meant to do that?
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  2. fangio
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    fangio Active Member

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    Duh? You have to drain the water, so how can you keep it pressurised? When the pump comes out, there's a great big hole in the cooling system!
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  3. mx_rab
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    mx_rab Member

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    Ooooo good come back hahaha personally have no idea what your friendhas been reading. If this is true though i would like to know how its done.
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  4. Lemon S3
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    Lemon S3 Alex

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    I doesn't make sense to me but he asked me to ask anyway. Might you have to pressurise it afterwards, I'm guessing to test for leaks?
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  5. mx_rab
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    mx_rab Member

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    Well being a pump it will pressurise the system itself once the engine is running.
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  6. Geraldy212
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    Geraldy212 Sportback owner

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    No MX, the pump only circulates the water around this closed system. The pressure comes from the water being heated up, and expanding. Excess water ends up in the header tank. Max pressure is reached just after turning off the engine. Since the block is still very hot, and there is no cooling by the radiator, then for a few minutes at least the temperature/pressure may rise. That will be max pressure and that is the time to look for any external leaks. Anyway, make sure your friend puts the recommended coolant into the system and not plain water.
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  7. scotty2hotty
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    scotty2hotty Member

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    your friend is changing his cambelt?? and is asking how to keep the water system pressurised with a big hole where the pump should go ?????
    sounds like a recipe for disaster.
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  8. mike foster
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    mike foster Fossie

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    Spot-on ! His friend doesn't have a clue and should definitely not be messing about with the cambelt.
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