Its not a sensor - its the block heater. Only in Malibu's do they leak.
There's a trick to replacing them.
Long weekend in Canada - car springs a leak. Make it to the garage - power
is out. Oh happy day. :)
My '99 Malibu (V6) has a coolant leak, and I'm not sure what the sensor is
that it's coming from.
It only seems to leak when the motor is off at a certain crank point. At
first I thought it was the water pump, because all the coolant had
evaporated off the motor in the heat before I could take a closer look, then
this morning I cranked it over after inspecting the pump (removing the belt
and pully and reinstalling), and it started leaking again.
Jacked it up, and took a picture - can't find this sensor in my Haynes
Here's a link to the picture - anybody give me a clue? It looks like it is
right above the crankshaft position sensor - hard to see.
Click to see the full signature.