Those are signs of a blown head gasket or a cracked cylinder head.
Losing coolant with no apparent leaks, White smoke out the exhaust that has a sweet smell to it,
it sounds like your coolant over flow tank is leaking. it is a common problem with these cars. might also check your radiator for leaks or your exhaust for coolant, but if there is coolant in your exhaust that would mean blown heads
Engine oil mixing with coolant and/or coolant mixing with engine oil.Losing coolant but don't see any leaks. White smoke (steam) coming out the exhaust that has a sweet smell to it.
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
Probably the thermostat is sticking.
Seems the flexpipe leaks at the ends...
catalytic converter converts some oxides to water, so water not a surprise in and of itself. Is there Antifreeze in your exhaust moisture? are you sure it is antifreeze? are you loosing coolant reservoir level at a measurable rate? Coolant only gets into exhaust by way of the cylinder head developing a leak. from the cooling jacket into the exhaust port of a cylinder. if it was leaking into the combustion chamber, you would have coolant in your oil, and the plug would be fouled with scale. possible to attempt a leak seal with K&N Metal Block Seal, if and ONLY if the leak is NOT into a combustion chamber. Or do the right thing and get the head repaired. Or, have your intake gaskets checked for leaks. On the 3.4 the intake gasket can leak coolant into the engine.
If it had no leaks it would not be loosing coolant. So therefore it does have a leak. It can be leaking in a spot where the coolant burns away before dripping on the ground. Also a blown head gasket is a possibility. Look for coolant in the oil. A heater core can leak. Do you smell coolant inside the car or are the windows fogging up or developing a film. You need to have a pressure test run on the cooling system and find this leak.
If you aren't seeing oil leaking in the driveway then it almost has to be burning it due to worn valves or pistons. There most likely is exhaust smoke but you just can't see it yet. One other thing to check is your engine coolant. A leaking main seal will allow engine oil into the coolant side of the engine which will turn your coolant a milky white frothy looking liquid.
The wet appearance of the cylinder exhaust and intake port side on a diesel engine can be attributed to several factors, including fuel leaks, coolant leaks, or excessive fuel in the combustion chamber. Fuel leaks may occur from injectors or fuel lines, while coolant leaks could stem from a blown head gasket or cracked cylinder head. Additionally, incomplete combustion due to poor fuel atomization or timing issues can lead to unburned fuel accumulating in the ports. Regular maintenance and inspection can help identify and address these issues.
It leaks coolant.
The coolant leaks out.