If you can find no outward leaks, and you are sure its not being blown back into the overflow reservoir by a bad radiator cap, the only other explanation would be a blown head gasket, but if that were the case you would see white smoke from your exhaust, and smell a sweet smell from your exhaust. check all hoses and other possible locations for leaks before exploring the head gasket, many people lose their coolant through bad radiator caps while they are driving and never realize until its too late, it will spill out the overflow on the road and virtually nothing while sitting still.
No, the freeze plugs are on the engine.
can be water pump, radiator, heater core, thermostat housing, hose, or freeze-out plugs
If your 1998 Jeep Cherokee is leaking coolant, it might be a seal but it is more likely that it is a hose. This might also be a radiator leak, a loose hose clamp, or the freeze plugs in the radiator.
Freeze plugs. More likely that hoses are leaking or thermostat housing is leaking. Freeze Plugs generally NEVER leaks unless engine block has had frozen coolant in it. Hence, Freeze Plugs.
Corroded freeze plugs, blown radiator hose, corroded radiator (My 96's turned green and crumbled away)
You drain coolant from the radiator. but according to the book ther are two plugs on the engine block that need to drain the coolant from.
they are at the bottom corner of the radiator.
The freeze plugs on a Honda Passport are located along the front of the engine block. They allow for expansion in the event the coolant freezes to prevent cracking.
Drain the oil, not normally. Drain the coolant, yes.
there are freeze plugs on side of engine if the leak is at the front, check to see if coolant is leaking from water pump and running down to bottom of engine
Check the freeze plugs. large round plugs on either side of the block. Those are there for if your coolant freezes, they will go instead of cracking the block.
It could be from many areas such as the water pump, the radiator, radiator hoses, heater hoses, heater core, freeze plugs, intake manifold gaskets, etc. Take a good flash light and try to locate the source of the coolant leak. If you have no luck that way take it to your local garage and they can pressure test the coolant system to force the leak.