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Thread: Leak coolant reservoir

  1. #1
    Join Date
    Feb 2008
    Location
    NSW
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    105

    Leak coolant reservoir

    Keen for advice on this one.
    Recently had routine service on a 5 year old/50K kms Golf 7.5 and VW have flagged a leak into the sensor on top of the coolant reservoir and have recommended replacement of the reservoir. Some urgency to this apparently with the service advisor indicating that waiting until the coolant level starts to drop is not recommended - the fact that the sensor is involved risks coolant leeching into not only this wiring harness but others as well on the same "circuit" leading to big $$$ repairs. A look at the connector shows some slight seepage only, but no signs of that typical crusting you see with coolant leaking. And the service advisor's nightmare scenario of coolant seeping upwards into a pair of thin insulated wires to then go marauding throughout other circuits seems very far fetched to me.
    My gut feel is to wait for the water pump/thermostat housing to give up again and to sort a new coolant reservoir then but keen to know everyone's thoughts, in particular whether anyone has ever heard of the leaking coolant reservoir causing widespread electrical damage.
    Cheers

  2. #2
    Join Date
    Feb 2011
    Location
    Newcastle
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    For the sake of $80 I would just replace it. I guess the service centre is basing their advice on the fact that they wont see the car for another 12 months or 15,000km in which that time frame the small issue could develop into a bigger issue.

    5Q0121407M - Coolant Reservoir, Audi 8V S3/TT & Volkswagen MK7 GTI/R– VAGPARTS Australia
    2017 Ford Fiesta ST
    2015 Audi SQ5 bi-turbo V6 TDI family hauler

  3. #3
    Join Date
    Feb 2008
    Location
    NSW
    Posts
    105
    Thread Starter
    Thanks Lucas_R. Agree re just changing it now, even though I reckon the catastrophic scenario of widespread coolant damage to electrics is a load of bollocks. Seems pretty straight forward DIY and my local VW Parts place has a replacement coolant tank plus a 1 litre bottle of ready to go pre diluted coolant for $110 in stock and ready to go.

  4. #4
    Join Date
    Feb 2011
    Location
    Newcastle
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    Nothing like a bit of scare mongering to make you buy something!!

    Yes its a pretty basic DIY to change the coolant reservoir and for $110 in total with coolant its something you could do in the driveway on the weekend.
    2017 Ford Fiesta ST
    2015 Audi SQ5 bi-turbo V6 TDI family hauler

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