An exhaust leak after the catalytic converter shouldn't effect the performance of the engine. If the "Check Engine" light has illuminated, have the codes diagnosed at your local auto parts store. They will provide this service for free.
If it is leaking trans fluid into the coolant it can cause overheating.
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.
It's probably leaking from a bad intake manifold gasket. You could be leaking from the heater hose that comes out of the firewall very close to the manifold. They sometimes leak there and drip down on the manifold. If it drips on a coil, it can eventually ruin the coil. It happened to me.
There is a side pan which is sometimes accesable if you remove the wheel.
Because the plastic housing is cracked. That is what happened to mine.
Sometimes breasts start leaking in the eighth or ninth month.
normally if a car is leaking water it is because of the air conditioning in the car being cold so the car will sometimes leak if the ac is running long enough and cold enough.
Sometimes a leaking valve cover gasket can be fixed by simply retorquing the bolts to their proper torque. If that doesn't solve the problem, the gasket will have to be replaced as per your engine manufacturer's specifications.
im guessing someone has told you that you have a 'leaking valve cover gasket'. the valve cover is normally on the top of the engine,above the pistons, sometimes its where you put the oil into. The gasket is where the cover joins with the block.
perhaps it is water from the air conditioner, sometimes the drain hoses come loose.
If it's out of a freeze plug you might want to take care of it yourself. Sometimes if you don't keep good antifreeze in an engine the freeze plug will rust through and start leaking. Sometimes they just start leaking anyway. If you can get the old freeze plug out and get the surfaces clean you might be able to put in one of the replacment type freeze plugs. That part isn't too hard, it just depends on where the freeze plug is.
It means you need to see a doctor.