Breakdown of Als wir feststeckten, war die Lüftung leider schon kaputt.
sein
to be
wir
we
leider
unfortunately
schon
already
Questions & Answers about Als wir feststeckten, war die Lüftung leider schon kaputt.
Why is Als used for "when" here instead of Wenn?
In German, als is used for a single, one-time event in the past (like getting stuck on this specific occasion). Wenn is used for present or future events, or for repeated events in the past (meaning "whenever"). Since getting stuck here was a single past event, you must use als.
Why does the second half of the sentence start with the verb war?
The entire first clause (Als wir feststeckten) acts as the first block of information (Position 1) in the overall sentence. Because German main clauses require the conjugated verb in Position 2, war must immediately follow the comma, pushing the subject (die Lüftung) to Position 3.
The verb feststecken (to be stuck) is separable. Why isn't the prefix fest separated here?
Because it is in a subordinate clause introduced by the conjunction Als. In subordinate clauses, the conjugated verb is sent to the very end of the clause, where it reconnects with its separable prefix as a single word. If this had been a main clause, it would have split: Wir steckten fest.
What is the exact difference between Lüftung and a word like Klimaanlage?
Lüftung refers generally to a ventilation system or air vents (which simply circulate outside air), whereas Klimaanlage specifically means an air conditioning unit (which actively cools and treats the air). Both are great B2 vocabulary words for car or building issues, but they describe slightly different mechanisms.