Do I have a bad radiator, or is it something else?

My strongest suspicion is the water pump, but every path water flows needs to be checked. I don't think it's the radiator.

Many possibilities. Switch the engine off and LOOK. I suggest you do this as a matter of urgency before your leak becomes larger and you find yourself without coolant.

Use your eyes.

My "idea" is for you to LOCATE the leak and repair the problem.

It's best when you ask a repair question here to IDENTIFY your vehicle, engine and odometer reading.

Depending on what you are driving and how many miles have accrued, we might have a specific answer, instead of various general answers.

Check for leaking from water pump.

Look at all coolant hoses for damage, including clamps.

Look at radiator.

Possibly a "core plug" that is rusted.

A heater core or heater control valve can leak.

You need to open the hood and identify the leak location. If you can't do that, then visit a mechanic soon.

If your leak suddenly gets worse, and your engine overheats, and you keep driving to get home (famous excuse) then you may warp an aluminum cylinder head, and then have the dreaded and expensive cylinder head gasket leak!

If your temperature gauge is suddenly high, or the instrument panel warning light comes on, then immediately get off the road and shut the engine off. Seek help.

Most likely it will be a deteriorating hose. They do need replacing from time to time. When the hose deteriorates, it gets mushy around the connections. When the system heats up and builds pressure, then the coolant will find its way out of the loosened connections. Check both the top and the bottom hoses!

What is wrong with your vehicle? If it is overheating, the radiator is just one of the possible causes.

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