White smoke from the exhaust is a sign of a blown head gasket. Stop driving the car until you get this repaired. Coolant in the combustion chamber will destroy this engine in short order.
leaking or cracked manifold
it could possibly have either a blown head gasket or intake manifold gaskets leaking
Are you referring to a loud exhaust sound? If so, it could be (Going from the engine back to the tailpipe) a cracked or leaking exhaust manifold - a leaking exhaust pipe - a leaking catalytic converter - a leaking muffler. That covers the exhaust system. If you are talking about a noisy clattering sound in the engine, you could possibly need a valve adjustment.
thermostat gasket probably leaking. replace thermostat and gasket making sure that thermostat housing is flat.
Most likely you have a blown had gasket.
Most likely the intake manifold gasket is leaking.
the thermostat is in between the a/c compressor and the alternator follow the top radiator hose on the right and it will take you to the intake manifold the hose will run into a medal tube that is bolted down to the engine undo the bolts and your thermostat is right there but make sure you drain your cooling system first or it will be leaking everywhere
Intake manifold is leaking, or worse, cracked cylinder most likely tho, the intake manifold.
Think you may have bad head gasket, seal or cracked head. Water is getting into your engine which usually causes white smoke. Also leaking antifreeze is from these same causes. Hope this helps. Ken
only if the gasket under thermostat is leaking and may-be it's the hose clamp on the hose that is leaking
if it is lowering oil and water both and is not leaking it may have a blown head gasket and it is going out the tailpipe
leaking gasket try tightening the bolts a little might help