740 Anti freeze leak

Discussion in 'Volvo 740' started by arnold, Nov 30, 2004.

  1. arnold

    arnold Guest

    Hi there !! My friend has a 1990 740 sedan and there is an antifreeze leak
    (puddle on the ground) It drips from where the engine meets with the
    transmisson, on the passenger side, but it could be squirted from a pinhole
    somewhere, I cant really tell where it is coming from, but I suspect either
    a freeze plug or the 2 hoses in the back that go to the heater core inside
    the car though the firewall.

    The question is, how dificult is it to replace the hoses, I can see one
    clamp, the one that connects to the pipe that comes from the water pump, the
    other one is under the intake manifold. Does the manifold have to come off?

    Thanks

    Arnold
     
    arnold, Nov 30, 2004
    #1
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  2. arnold

    James Sweet Guest

    "arnold" <> wrote in message
    news:58Zqd.1246$zK1.755@trndny05...
    > Hi there !! My friend has a 1990 740 sedan and there is an antifreeze

    leak
    > (puddle on the ground) It drips from where the engine meets with the
    > transmisson, on the passenger side, but it could be squirted from a

    pinhole
    > somewhere, I cant really tell where it is coming from, but I suspect

    either
    > a freeze plug or the 2 hoses in the back that go to the heater core inside
    > the car though the firewall.
    >
    > The question is, how dificult is it to replace the hoses, I can see one
    > clamp, the one that connects to the pipe that comes from the water pump,

    the
    > other one is under the intake manifold. Does the manifold have to come

    off?
    >
    > Thanks
    >
    > Arnold
    >
    >


    The hoses aren't too hard to replace, I've done it on the side of the road
    in the middle of nowhere in Alberta in the winter, pays to replace them
    pre-emptively when you have a nice warm garage. A trick I've used to track
    down the leak is to unplug the overflow hose from the radiator, plug the
    nipple on the radiator with a scrap of hose and a bolt or something, and
    then use an air compressor connected to the hose to pressurize the cooling
    system to about 5 psi. Don't go too high or you'll make a leak where there
    isn't one, but this allows you to simulate operating pressure without having
    the engine hot so you don't burn your hands on the exhaust manifold or get
    sprayed with scaulding hot coolant. You'll probably see coolant dripping or
    spraying from somewhere as soon as you pressurize it, should be a simple
    matter to feel around and find out where it's coming from.
     
    James Sweet, Nov 30, 2004
    #2
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  3. The manifold does not need to come off. If the pipe from the pump is metal
    make sure that it is integral and not leaking due to rust from inside. It is
    most likely a leak from the heater pipes before they enter the bulkhead.

    Cheers, Peter.

    "arnold" <> wrote in message
    news:58Zqd.1246$zK1.755@trndny05...
    > Hi there !! My friend has a 1990 740 sedan and there is an antifreeze
    > leak
    > (puddle on the ground) It drips from where the engine meets with the
    > transmisson, on the passenger side, but it could be squirted from a
    > pinhole
    > somewhere, I cant really tell where it is coming from, but I suspect
    > either
    > a freeze plug or the 2 hoses in the back that go to the heater core inside
    > the car though the firewall.
    >
    > The question is, how dificult is it to replace the hoses, I can see one
    > clamp, the one that connects to the pipe that comes from the water pump,
    > the
    > other one is under the intake manifold. Does the manifold have to come
    > off?
    >
    > Thanks
    >
    > Arnold
    >
    >
     
    Peter K L Milnes, Nov 30, 2004
    #3
  4. arnold

    arnold Guest

    Thanks for the sugestion, I will get the hoses from FCP Groton, and replace
    them anyway. and will build some contraption to pressurize the cooling
    system.

    Thanks

    Arnold
    "James Sweet" <> wrote in message
    news:Om3rd.5660$Hk6.908@trnddc05...
    >
    > "arnold" <> wrote in message
    > news:58Zqd.1246$zK1.755@trndny05...
    > > Hi there !! My friend has a 1990 740 sedan and there is an antifreeze

    > leak
    > > (puddle on the ground) It drips from where the engine meets with the
    > > transmisson, on the passenger side, but it could be squirted from a

    > pinhole
    > > somewhere, I cant really tell where it is coming from, but I suspect

    > either
    > > a freeze plug or the 2 hoses in the back that go to the heater core

    inside
    > > the car though the firewall.
    > >
    > > The question is, how dificult is it to replace the hoses, I can see one
    > > clamp, the one that connects to the pipe that comes from the water pump,

    > the
    > > other one is under the intake manifold. Does the manifold have to come

    > off?
    > >
    > > Thanks
    > >
    > > Arnold
    > >
    > >

    >
    > The hoses aren't too hard to replace, I've done it on the side of the road
    > in the middle of nowhere in Alberta in the winter, pays to replace them
    > pre-emptively when you have a nice warm garage. A trick I've used to track
    > down the leak is to unplug the overflow hose from the radiator, plug the
    > nipple on the radiator with a scrap of hose and a bolt or something, and
    > then use an air compressor connected to the hose to pressurize the cooling
    > system to about 5 psi. Don't go too high or you'll make a leak where there
    > isn't one, but this allows you to simulate operating pressure without

    having
    > the engine hot so you don't burn your hands on the exhaust manifold or get
    > sprayed with scaulding hot coolant. You'll probably see coolant dripping

    or
    > spraying from somewhere as soon as you pressurize it, should be a simple
    > matter to feel around and find out where it's coming from.
    >
    >
     
    arnold, Dec 1, 2004
    #4
  5. arnold

    grtdane63 Guest

    Arnold: Get a spare cap off a Volvo brake reservoir it will fit on the
    radiator reservoir. Go to the parts store and get a screw type valve stem,
    drill the proper sized hole in the cap and install the stem on the brake
    cap. Use this to pressurize the cooling system. Use a bicycle hand pump, 5
    to 7 lbs should be enough to check for leaks.

    Harold


    "arnold" <> wrote in message
    news:ku8rd.2006$nq6.1582@trndny09...
    > Thanks for the sugestion, I will get the hoses from FCP Groton, and
    > replace
    > them anyway. and will build some contraption to pressurize the cooling
    > system.
    >
    > Thanks
    >
    > Arnold
    > "James Sweet" <> wrote in message
    > news:Om3rd.5660$Hk6.908@trnddc05...
    >>
    >> "arnold" <> wrote in message
    >> news:58Zqd.1246$zK1.755@trndny05...
    >> > Hi there !! My friend has a 1990 740 sedan and there is an antifreeze

    >> leak
    >> > (puddle on the ground) It drips from where the engine meets with the
    >> > transmisson, on the passenger side, but it could be squirted from a

    >> pinhole
    >> > somewhere, I cant really tell where it is coming from, but I suspect

    >> either
    >> > a freeze plug or the 2 hoses in the back that go to the heater core

    > inside
    >> > the car though the firewall.
    >> >
    >> > The question is, how dificult is it to replace the hoses, I can see one
    >> > clamp, the one that connects to the pipe that comes from the water
    >> > pump,

    >> the
    >> > other one is under the intake manifold. Does the manifold have to come

    >> off?
    >> >
    >> > Thanks
    >> >
    >> > Arnold
    >> >
    >> >

    >>
    >> The hoses aren't too hard to replace, I've done it on the side of the
    >> road
    >> in the middle of nowhere in Alberta in the winter, pays to replace them
    >> pre-emptively when you have a nice warm garage. A trick I've used to
    >> track
    >> down the leak is to unplug the overflow hose from the radiator, plug the
    >> nipple on the radiator with a scrap of hose and a bolt or something, and
    >> then use an air compressor connected to the hose to pressurize the
    >> cooling
    >> system to about 5 psi. Don't go too high or you'll make a leak where
    >> there
    >> isn't one, but this allows you to simulate operating pressure without

    > having
    >> the engine hot so you don't burn your hands on the exhaust manifold or
    >> get
    >> sprayed with scaulding hot coolant. You'll probably see coolant dripping

    > or
    >> spraying from somewhere as soon as you pressurize it, should be a simple
    >> matter to feel around and find out where it's coming from.
    >>
    >>

    >
    >
     
    grtdane63, Dec 1, 2004
    #5
  6. arnold

    James Sweet Guest

    "arnold" <> wrote in message
    news:ku8rd.2006$nq6.1582@trndny09...
    > Thanks for the sugestion, I will get the hoses from FCP Groton, and

    replace
    > them anyway. and will build some contraption to pressurize the cooling
    > system.
    >



    Another trick you can use for that is go to a scrapyard and get a coolant
    resivoir cap, drill a hole in it and glue in a tire valve which you can get
    anywhere that sells bicycle or car parts. Then you can pump it up with a
    simple tire pump if you don't have an air compressor.
     
    James Sweet, Dec 1, 2004
    #6
  7. arnold

    James Sweet Guest

    "grtdane63" <> wrote in message
    news:y8ard.3881262$...
    > Arnold: Get a spare cap off a Volvo brake reservoir it will fit on the
    > radiator reservoir. Go to the parts store and get a screw type valve stem,
    > drill the proper sized hole in the cap and install the stem on the brake
    > cap. Use this to pressurize the cooling system. Use a bicycle hand pump,

    5
    > to 7 lbs should be enough to check for leaks.
    >
    > Harold



    Oops, I should have read that post before I replied to the other.
     
    James Sweet, Dec 1, 2004
    #7
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