A Seoul subway car marked 약냉방칸 still has air conditioning. It’s simply set a little warmer than a regular car. Seoul’s published guidance says the difference is one degree: 24°C for a regular car and 25°C for a weak-cooling car.
That small label can solve the wrong problem if you read it as “the cool car.” The Korean word means the opposite. If you’re already sweating, you’ll want to avoid it.
“Weak cooling” really is relative
The full term is written 약냉방칸 and pronounced roughly yangnaengbangkan (“weak-cooling car”). The useful contrast is ilbankan (일반칸, “regular car”). “Weak” modifies the cooling, so the label doesn’t mean broken air conditioning or a fan-only carriage.
According to Seoul’s July 2024 subway cooling guide, regular cars are set to 24°C in summer and weak-cooling cars one degree higher. I think that one-degree comparison matters more than memorizing a supposedly perfect temperature. A set point isn’t a promise that every seat will feel identical.
The same guide says the coldest areas are near the priority seats at both ends of a car, while the center tends to be warmer. Crowding can also push the cabin temperature up. So if you’re cold but can’t change cars, moving toward the middle is a reasonable first move. If you’re hot, the ends may feel better.
The car number changes with the line
There isn’t one “weak-cooling car number” for the whole Seoul system. The guide lists the fourth and seventh cars on Lines 1, 3, and 4; the fourth and fifth on Lines 5, 6, and 7; and the third and fourth on Line 8. Line 2 doesn’t have separate weak-cooling cars in that guide because of its high crowding level.
That’s already enough to make a screenshot of one line’s car map unreliable on another. A 2019 GS Caltex explainer also frames the weak-cooling car as an option for people who find regular subway cooling too cold, while telling heat-sensitive riders to avoid it. The point is choice, not a special premium section.
Honestly, the practical rule is much shorter than the list: check the operator’s current guide for the line you’re about to board. Don’t carry a single car number from one train to the next.
The word sounds different from how it looks
Here’s the Korean detail an English sign won’t give you. The first syllable is written 약, but before 냉 the final k sound changes to ng. The National Institute of Korean Language gives the pronunciation of 약냉방차 as [양냉방차].
In other words, the spelling begins with 약, but the spoken form begins closer to yang. The institute points to the standard pronunciation rule that a final ㄱ becomes ㅇ before ㄴ or ㅁ. You don’t need that rule to ride the train, but it explains why the word can sound different from what an English transliteration of the sign suggests.
Pick for your body, not for the label’s color
If the cabin feels too cold, look for 약냉방칸 or move toward the center of the car. If it feels too warm, avoid the marked car and try the ends of a regular one. That’s a comfort choice, not a rule of subway etiquette.
It also isn’t worth treating 25°C as a measurement of the air around your seat. Doors open, people pack in, and the guide itself notes that crowding raises cabin temperature. The label tells you the intended relative setting. It can’t guarantee the result.
I’d remember the meaning and forget the universal number, because there isn’t one. On a different line, the same “fourth car” shortcut can put you exactly where you didn’t mean to go.