Yup - the sensor pushes up into the bottom of the expansion tank. There is
a magnet attached to the bottom of the "pop-up" indicator, which signals
when you're low on coolant. Sometimes the magnet comes loose, and stays at
the bottom of the tank. That, of course, keeps the reed switch in the
sensor closed, and tells the body computer you're low on coolant. The
sensor can be replaced as a separate part - you don't have to replace the
whole expansion tank. You do pretty much have to remove the tank to get at
the thing, however. You may be able to finesse it out if you're agile ;-)
You unplug the wire connector, and give the whole thing about a 1/4 turn
counter-clockwise, then the sensor drops straight down and out of the tank.
Put the new one in, re-connect the wire harness, and you're good to go.
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