-------------- Original message from Charlie England
    <ceengland@bellsouth.net>: --------------


    > The 2nd gen car that's dead in my hangar is dead because I got
    dependent
    > on the 'raise the dead' buzzer that went off when the sensor *in
    the
    > overflow tank* sensed low coolant. When the upper tank on the
    radiator
    > cracked & lost coolant while driving, the overflow tank still
    had plenty
    > in it & I never got the buzzer.
    >
    > This brings up a potentially significant point. Most folks say
    to use
    > system pressure to detect leaks. I can't say from experience
    that it
    > works, but I can say that a level sensor in the catch tank
    *won't* work
    > to detect in-flight problems because the level there isn't
    likely to
    > drop until the system cools & tries to suck coolant back from
    the reservoir.
    >
    > I'll try to take a look at how it works for you some time today
    when I
    > take a break from doing my taxes. (Weather induced major change
    of plan
    > from flying down to St Elmo for lunch & SQ2000 inspection.
    Sorry, Paul.)
    >
    > Charlie
    >
       Charlie and All,

            My 2nd gen (88,4.3L Chev. power) has the coolent level
    sensor screwed

    onto the top tank of radiator......When covered with coolent all
    is quiet......but

    as coolent starts to get low it (as makeing a sharp turn) it
    sounds a buzzer until

    covered with coolent again......Warning you to check coolent
    level......Sensor

    is a one wire hookup......One would need to check RX7 circuitry as
    to what is

    necessary to make it work for an A/C........FWIW

     
    Kelly Troyer