S70 coolant sensor

Discussion in 'Volvo S70' started by mkr5000, Nov 27, 2007.

  1. mkr5000

    mkr5000 Guest

    I replaced the coolant sensor in my overflow tank (simple deal -- just
    snaps in) but the coolant level warning light is still on.

    I disconnected the battery as well.

    Any ideas?

    How does this sensor work? I measured the good part with a VOM and
    have an open circuit, yet when I dipped it in water -- no change at
    all. ?

    Is there something I'm missing on this?

    mkr5000, Nov 27, 2007
  2. mkr5000

    cognite tute Guest

    I have the same problem.

    my coolant tank developed a leak, I got a new one from the dealer,
    and replaced it.

    there is a magnet in the float in the coolant tank.

    the sensor responds to the magnet location.

    leak is fixed, coolant level is at the right level but coolant light is
    still on.

    I have to get timing belt replaced soon, so will have them look at that
    at same time.

    cognite tute, Nov 27, 2007
  3. mkr5000

    mkr5000 Guest


    So a simple magnetic reed switch in that sensor which probably didn't
    need replacing.

    Makes sense as I get the light off when I disconnect the sensor -- so
    that would mean the magnet isn't moving in the tank and keeping the
    switch closed. (probably).

    I had some chocolate shake get in the system -- thought I had cleaned
    it out -- but may have to get a new tank.

    Thanks for the tip.
    mkr5000, Nov 27, 2007
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