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A leaking gasket, a leaking filter, or a leaking drain plug....
Check radiator hose, leaking water pump, look for hole in radiator, leaking coolant bottle or leaking seals.
If a Mazda MPV is leaking yellow fluid then it is possible that the fluid is brake fluid. It is best to take the car to a mechanic right away.
from your overflow valve
There are only two ways to lose oil: leaking or burning. If it's not leaking, it's burning.
heater core leaking
check Mazda forum. Answer is within
Probably leaking heater core.If not repairable get one from junkyard.
Under the drivers seat
just replace the whole caliper.
rear freeze plugs
it could be the heater is leaking!