if it,s in the furnace, look for a drain pan under the coils, there should be a drain hose comming from it. cold water grows a mold , the drain is pluged, use a pipe cleaner, or a thin bottle brush to open it, put a small amount of bleach in to the drain pan, check at an air conditiong place they sell a tablet that will inhibit mold groth, or at a pool supply buy some clorine tablets, small ones. place 1 or 2 in pan a month,
The radiator will need to be replaced. Sometimes, it may seem that the radiator itself is leaking but it could be the radiator "hose" that is leaking. In this case, the radiator hose needs to be replaced and clamped tightly.
If the hoses are all tight, Then the radiator must be leaking. REPLACE RADIATOR
put radiator sealer in it or crack an egg in it
Stop leak products for the radiator from auto supply stores are not meant as a long-term solution. They should only be used to get you home or to a mechanic who can repair or replace the radiator properly.
The question is referring to pour in type cooling system sealers such as Stop-Leak. If the radiator itself is leaking Stop-Leak will likely come right out as it is designed for small seal and gasket sealing.
A car with a leaking radiator can be driven, but when the coolant leaks out, the engine will overheat and when the engine gets hot enough, it will seize-up, the car will stop, and the engine will have suffered severe damage.
Call a professional.
Unplug evaporator drain with a flexible wire or low pressure air
if it is leaking from the radiator you can crack an egg and put it in the radiator and it will solve your problem
The condensor drain tube is clogged. Find the drain line and unclogg it.
There is an o ring on the plug that will need replaced.
Remove The Radiator And Take It To a Good Radiator Shop. Most Likely Yours Can Be Cleaned And Repaired. When You Reinstall It, Add New Antifreeze Plus Water Pump Lubricant. This Will Help Stop Corrosion. Good Luck