Leaks that I have found on this system:
Porous heater or radiator hoses that only weep under pressure.
Failed radiator cap.
Cracked plastic coolant tank, either around the filler neck or down
the seam.
Bad water pump only leaking when hot and under pressure -- this one
can be hard to find.
Failed auxillary pump that only leaks when running -- look for coolant
traces below the pump or coolant in the rubber holder.
Failed head gasket leaking out the side. Failed head gasket leaking
into the coolant passages, blowing coolant out the overlfow (check for
pressurized hoses when cold).
Cracked head, same symptoms as the head gasket.
Pressure test the system, that should at least eliminate some of the
common possibilities.
Peter
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