Major Coolant leak

A NEW RECORD FOR LONGEST 1ST POST.
2004 Camry XLE 4 cylinder 207 thousand miles
guess at 2.4L engine. but there are 3 engines offered.
2AZ-FE ENGINE SURE.
THAT OVERHEATS,
LET ME CONDENSE YOUR POST.
1: NEW LEAKING CAB HEATER CORE.
And sure after it stinks how can it not 50%AF toxic fluid in the passengers foot well carpets. gee get them steam cleaned by pro's (removed and pro cleaned)(

2 :now the coolant is leaking and spraying in the engine bay well that is normal on all cars this old (not serviced, abused)
all hoses bad and 19 years old cracked and leak what's new there, zero..nada.

or water pump leaks
or radiator leaks, sure, 19 years old sure it can.
nothing new there.
what will be ,will be. there is no magic to car repair
--------------------- NOW COMMENTARY BLIND------------
best guess:
he used bar's leaks to stop tiny leaks. that is all it does
it never ever fixed cracked hoses ,bad water pumps nor fixes radiator leaks. or bad head gaskets or warped heads.

if he was a pro he;d have told you the car needs major service, and parts but when told by him, the wallet was dry
outcomes snake oil BAR's leaks.
fix it right or patch it and pray. <<<< your CALL !

BAR'S: (MAKERS REAL NAME)
it can help some times in pinch 1000 miles from home
it's a band-Aid to a broken leg. ( not magic, it is a desperate act)<, NO BLAME ME IT IS YOUR CAR.

old cars are all like this they have vast problems and most ive seen 10 problems ignored by the owner.past and present. (all) they add up, and then the camels back is broken with 1 more gain if straw.!
machines need service, if not they fail or fail hard.

if the engine is allowed to overheat too badly the engine is wrecked, ever price out cracked heads and engine blocks.
some cars heater cores are $2000 fix, dash out 12hours labor.+parts.
seems to me you got a SUPER DEAL there.
MY GUESS JUST HEATER COR HOSES BAD
AND ARE THE HOTTEST HOSES AND WHY.

Each leak must be found and if hoses crack they are all bad, for sure if 19 years old.
the RAD tank ends can crack TOO.
and the pump fail and the path of the whole coolant loop can fail and crack a real pro finds them all.
even intake manifolds can leak or thermostat housing can crack, SEE????????
TOYOTA Camry 04
lot to fail on any cooling system
even rad fans.
WE CHECK AND CURE ALL LEAKS FIRST
UNDER FULL HOT ENGINE PRESSURE,NEAR 15PSI
FOR LEAKS, PARKED HOOD UP EVEN RUN FOR 30 MINUTES TO FIND THEM ALL
CAREFUL AND COMPLETE OBSERVATION,
FOR SURE DRIPS OR TRICKY SQUIRTING OF 50%AF COOLANT.
NO 19YEAR OLD THERMOSTAT IS GOOD
AND IF BAD AND CAUSES OVERHEATING THE SIDE TANK NEXT TO RAD EXPLODES IN STEAM AND IS SUPER BAD FOR ANY ENGINE (JUST BEGGING TO WARP THE HEAD)
AND A NEW SERP BELT TO THE PUMP IS BEST.
THIS OLD.

It is normal to have a little white smoke when starting a cold engine because of condensation. If it continues and even billows out then you cold have a blown head gasket letting your water or antifreeze out of the radiator into the engine. If there is a quantity of white you should not run the engine as you could do major damage.

Open the container of antifreeze. Using a separate EMPTY gallon-size container, pour out HALF of the contents into the empty container, making sure not to spill any. Now, FILL the newly filled container with tap water. Fill the rest of the antifreeze with water, also. Now, you are ready to add antifreeze to your vehicle! Simply locate the radiator cap, (Don't touch it if it's hot!!) and unscrew it. Pour the desired amount of your mixed antifreeze into the radiator. Remember not to do this without proper knowledge!

DID YOU BLEED AIR OUT THE COOLANT SYSTEM.TO BLEED COOLANT SYSTEM, FILL THE COOLANT SYSTEM THROUGH THE RESERVOIR TANK OR THE RADIATOR UNTIL THE FULL COLD MARK IS REACHED.BESURE TO USE 50/50 HALF WATER AND ANTIFREEZE.YOU CAN BUY ANTIFREEZE THAT IS ALREADY PREMIX 50/50.AFTER ADDING ANTIFREEZE TO RESERVOIR OR RADIATOR FILL RADIATOR TO FULL MARK OR IF YOU DONT HAVE RADIATOR CAP ON RADIATOR POUR ANTIFREEZE IN THE OVERFLOW JUG UNTIL COOLANT LEVEL STAY THE FULL COLD MARK.WAIT AWHILE UNTIL COOLANT LEVEL STOP DROPPING.NOW INSTALL THE RADIATOR OR OVER FLOW JUG CAP.START THE ENGINE AND ALLOW IT TO RUN UNTIL NORMAL OPERATING TEMPERATURE IS REACHED AND THE UPPER RADIATOR HOSE BECOME HOT.STOP THE ENGINE AND OBSERVE THE COOLANT LEVEL IN THE OVERFLOW JUG. THE COOLANT LEVEL SHOULD BE AT THE FULL HOT LINE.ALLOW THE ENGINE TO COOL UNTIL THE AMBIENT TEMPERATURE IS REACHED THEN CHECK THE COOLANT LEVEL IT SHOULD BE AT OR ABOVE THE FULL COLD LINE.ADD MORE COOLANT IF NECESSARY. WARNING BECAREFUL WHEN OPEN THE RADIATOR CAP OR JUG OVER FLOW CAP.USE A LARGE RAG OVER THE RADIATOR CAP TO KEEP FROM GETTING SCALDED.OPEN RADIATOR CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDED.WAIT UNTIL ENGINE COOL DOWN BEFORE OPENING RADIATOR CAP OR OVERFLOW JUG CAP.WEAR SAFETY GLASSES.

Could be several things from radiator ,hoses,water pump, FREEZE PLUGS ,cracked head or block. You need to find out where the coolant is coming from to determine it.
If the car was hot and you poured fluid in it the block,head or head gasket could crack. If it was cold and you just had watr in it the block could crack or freeze plugs could have came out.

adding antifreeze on its own can be bad for your motor.. it needs to be added with water.. does it leak from your radiator cap/ overflow hose or from the radiator core.. ckeck you thermostat as well. it stays closed when the water is cold and opens when it gets hot.. it sounds like it could be stuck shut..

If you are loosing antifreeze with no apparent leak you may have a serious internal engine problem and should seek professional help. Stop driving the truck until you can have it looked at. If you are not loosing any coolant, then Service the cooling system. Drain and slush the radiator, replace the thermostat, clean the radiator fins, pour in a 50/50 mix of antifreeze and distilled water, and bleed all air from the system. Inspect the water pump to see if it is pumping correctly.

If your coolant level is dropping, I would suggest that you take a good look at the water pump. That is a very common coolant leakage probelm area on your vehicle. I change 2-3 a week.
Hope this helps.

The main problem could be a well known cobalt ignition issue. check all fuses, wires, and connections if you've worked on cars before and call to see if you still have any warranty left. This should be handled by a chevy dealer or chevy trained mechanic...to isolate the issue fast and avoid repeat visits to get er done.

Problem 1: buy a system heater to keep the engine warm at night.
You can buy them at any autoparts store . You take your pick from the variety.
Place a light 100 Watt Bulb near the battery but not too close to anything else where it might burn anything.

Problem 2. Check your coolant level to see if you have the proper level. Make sure you have 1/2 antifreeze and 1/2 water if you add any coolant /antifreeze and bleed the colant system. By running the car let it cool, then turn the radiator cap or turn the bleed screw provided on some cars near the thermostat outlet. Then adding some more water and coolant etc.The tightening the cap or bleed screw. When radiator is full. Check the radiator and and remove any debris that may be keeping the air out.

Problem 3. Will get fixed because your battery won't die.