It depends on if you see the antifreeze leaking or it is just disappearing. If it is just disappearing then a bad head gasket or cracked head may be the problem. The smoking could actually be vaporized antifreeze. If that is the case don't run it until you can get it fixed.
the radiator was replaced and the fluids are still evaporating or leaking out somehow. what other options could be wrong with the car overheating?
Coolant leaking from back? meaning exaust? If yes, then it's a head gasket or cracked head. Will not start because 2 or more sparkplugs are now wet with coolant.
Blown head gasket? Air trapped in the system (hasn't bled out yet)? Wrong cap?
I thought he said his mother...........I could be wrong.
Gas is leaking into your oil pan. If the head gasket is leaking, it needs to be replaced. While the cylinder head is off, look for a cracked piston or worn rings which may cause gas to leak into the oil pan. If the gasket has been replaced and you had no piston damage or bad rings, then change the oil and filter.
Head gasket could be bad
Probably a blown head gasket. Get a technician to look at it. If it is, it will be a major ordeal.
The headgasket has failed.
It could be caused by a defective pressure cap on the radiator cooling system.
Radiator cap could be lose or wrong size
there might be a leak some where in a coolant line. or maybe you have a leak in your radiator.
Defective water pump.
heatercore leaking! also change thermastat.
because you probaly changed it with the wrong water
Possibly head gasket.
Probably a blown head gasket. If the car has an (engine) oil cooler it might be a leak there too.
What joint exactly is leaking on you p-trap?