My latest Guess - water Pump?? 94 850 Turbo

Discussion in 'Volvo 850' started by UnderCoverG, Oct 25, 2003.

  1. UnderCoverG

    UnderCoverG Guest


    I've tried a few different things, with the latest being replacing the
    thermostat. Filled expansion tank back up with coolant, and observed the
    leaks. I notice on the passenger side wheel well coming from the assorted
    belts I am leaking coolant. Could this be my water pump?

    Also...I drove it for maybe 500 yards and returned to the drive way. THe
    expansion tank was steaming and a lot more coolant was leaking (I'm assuming
    the from the expansion tank)

    All ideas are greatly appreciated.

    '94 850 Turbo
    UnderCoverG, Oct 25, 2003
  2. From a point at sea, to the circles of your mind, this is UnderCoverG:
    If you are losing water from the expansion tank, it could be that you
    simply need a new cap for the tank - the cooling system operates under
    pressure, and if the cap's pressure valve has failed it may be letting
    water escape.

    However, it could also be a sign that the head gasket is gone. If this
    happens the cooling system becomes over pressurised by pressure
    leaking in from a combustion chamber. This simply forces water out of
    the cooling system under a higher pressure than it normally operates
    at. In bad cases it can lead to burst hoses and split radiators.

    When the engine is fully warmed up, try squeezing one of the radiator
    hoses. You should be able to squeeze the sides together under firm
    hand pressure. If it is tight like a drum it is over pressurised.


    Stewart Hargrave

    A lot faster than public transport

    For email, replace 'SpamOnlyToHere' with my name
    Stewart Hargrave, Oct 25, 2003
  3. UnderCoverG

    Mike F Guest

    Unfortunately the only thing that pressurizes the cooling system that
    fast is a leak from the combustion chamber. Usually this means a head
    gasket has failed or a warped head.
    Mike F, Oct 27, 2003
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