Why is my car losing coolant with no leaks?

“I was going home and a bit of steam came out of the hood that had a bit of a sweet smell.”source ↗

“The steam I had was a faint white and very whispy, if it wasnt for the smell I may have not noticed it as fast.”source ↗

“Drove my automatic Pathfinder manually held in 1st gear at high RPM up a steep hill.”source ↗

“Shortly after, noticed a coolant leak and light smoking coming from the hood area.”source ↗

“Poured a gallon of coolant into the radiator — it leaked out almost immediately.”source ↗

“I have a 1996 mustang gt, and I constantly have to top off coolant after every drive”source ↗

“There’s no puddles underneath the car so I’m assuming it’s evaporating somewhere, It don’t overheat and the oils not milky, 99% sure it’s not head gaskets, one of the hoses in the back came loose a while back, I put it back on, but maybe that’s the problem, how can I diagnose it?”source ↗

“The coolant wouldn’t stay in the reservoir. I could fill it up in the morning, and by the middle of the day, the coolant would be completely gone.”source ↗

“Yea… it’s happened a few times but i’ve take it to a few mechanics and they say everything looks ok :/”source ↗

“2011 ford focus 1.6 litre coolant leaking from the bottom pipe but both pipes seem warm so it’s less likely heater matrix ??”source ↗

“Looks like its leaking from those clamps. You need to clean it dry and restart with a close eye on it. Use brake clean”source ↗

“i will do asap, any ideas on what could be wrong”source ↗

“Noticed low coolant (below the blue mark while running, [pic is after top off at dealership]) at my 31,000 mile under hood check.”source ↗

“Further diagnostics revealed some suspicious residue on the right and left side of the radiator where the plastic housing meets the actual metal radiator.”source ↗

“Service writer Talks about weeklong process / warranty and 6 to 8 weeks on reimbursement. On top of not being able to tow with their loaner vehicle, which is a monthlong waitlist in itsself.”source ↗

“I don't understand how I'm about to foot the bill for all of this.”source ↗

“Well I usually just add water into it since I don’t really drive it, but I usually have to fill up the whole coolant reservoir, I’m not sure if any air got into it, this was like around a month ago”source ↗

“Hard to check cause there’s a cover below the engine so I can’t see if I’m leaking on the ground”source ↗

“Anyone have any idea why my coolant might be leaking here?”source ↗

“I’ve just replaced my thermostat housing recently with this part so can’t understand why it would be leaking already?”source ↗

“Also as seen in the photo that part is actually closed off which only adds to the mystery 😢”source ↗

“About a week ago I got a low oil pressure warning and took it to my usual mechanic. My car had barely any oil, and NO coolant.”source ↗

“Fast forward to this morning, I pop my hood before work, and the coolant is GONE.”source ↗

“The only thing that I’ve noticed that has been off lately is that my air conditioning hadn’t been working as well as it used to”source ↗

“I recently got EGR and in take cleaning and turbo work, post that I can see coolant reducing day by day, no leaks whatsoever ever and so far I have added 2-3 L of coolant and it’s all going down”source ↗

“If there is an intake leak - should I be getting white smoke from exhaust ?”source ↗

“Been noticing the coolant level drops in the reservoir over maybe 3 to 4 weeks, not dramatically but enough that I keep having to top it off. No puddle under the truck ever. No white smoke out the exhaust that I can see.”source ↗

“Before I commit to that, is there anything else worth ruling out on this engine first?”source ↗

“now I have this code not only is it not going to operating tempatures theres a coolant smell with no leaks what so ever.”source ↗

“is smelling coolant normal for this issue???”source ↗

“my car is having problems right now and i would love help diagnosing it. i feel like it’s the coolant intrusion problem but im not 100% sure”source ↗

“coolant is literally disappearing. my mechanic completely refreshed my coolant after it happened the first time, and i drove it for a day and the coolant was gone.”source ↗

“engine has a very rough idle and almost sputters out on startup. i think there’s also very faint white smoke coming out of the exhaust”source ↗

“some of the codes i’m getting are for cylinders deactivating due to high heat, cylinder 2 misfiring”source ↗

“I believe my water pump is leaking coolant. I just want to confirm this is definitely the water pump in looking at in this picture where you can see the coolant leaking from.”source ↗

“I put in coolant in the morning and it's empty by the next morning.”source ↗

“My coolant tank was empty. I noticed it about a week ago when my car was over heating. I check and my coolant was almost gone. I filled it and the next morning it was empty again”source ↗

“Crap a head gasket I hope not ◠̈ that sounds expensive”source ↗

“I don’t where it’s dripping but it seemed to be between the alternator and ac compressor”source ↗

“I have lost a good amount of coolant though but I thought that was from driving it in the summer”source ↗

“I do i have to refill it every couple of months it stops in the winter but picks up again in the summer”source ↗

“My car is not overheating. But I notice everyday I have to fill coolant. Like it's not staying in the pipe thing when I fill up. Nothing is leaking on the ground?”source ↗

“Every 2 to 3 weeks i see that the coolant level in the overflow reservoir bottle drops from max to min and I have to top it off again and again. I can't seem to find any leaks.”source ↗

“No puddles under the car. No white smoke no milky oil. It's been going on for like months and I just keep topping it off.”source ↗

“car has been overheating for like the past 2 weeks constant trips to the mechanic.”source ↗

“car overheated once again and took it to the shop again this time the antifreeze that they had put was gone.”source ↗

“they had checked the motor, fans, leaks and they couldnt find any. seriously any advice??”source ↗