Légtelenítjük a radiátort.

It is present tense, indicative mood, 1st person plural, with the definite conjugation.

So it means we bleed the radiator, we are bleeding the radiator, or in a step-by-step explanation even we now bleed the radiator, depending on context.

Hungarian present tense is often broader than English present tense, so one form can match several English translations.

Because Hungarian verbs have two main conjugation patterns:

• indefinite conjugation: used when there is no definite direct object
• definite conjugation: used when the direct object is definite

Here the object is a radiátort = the radiator, so it is definite. That is why the verb takes the definite 1st person plural ending:

• légtelenítünk = we bleed something / we do bleeding, in general
• légtelenítjük a radiátort = we bleed the radiator

You can break it down like this:

• lég = air
• -telen = without
• -ít = a verb-forming suffix meaning roughly make or cause to become
• -jük = we with a definite object

So historically the verb is built from the idea make airless / remove air from. That is why it is used for bleeding or venting a radiator.

Because radiátort is the direct object, and Hungarian usually marks the direct object with the accusative suffix -t.

So:

• radiátor = radiator
• radiátort = radiator as the object

In this sentence, the radiator is the thing being acted on, so it needs the accusative.

Hungarian has two forms of the definite article:

• a before a consonant
• az before a vowel

Since radiátort starts with r, which is a consonant, the correct article is a:

• a radiátort

If the next word began with a vowel, you would use az instead.

The ending -juk / -jük is the 1st person plural definite ending in the present tense.

Which version appears depends on vowel harmony:

• -juk after back-vowel stems
• -jük after front-vowel stems

Since légtelenít- contains front vowels, the correct form is -jük:

• légtelenítjük

So this ending tells you both:

• we
• with a definite object

Yes, it is completely normal.

Légtelenítjük a radiátort is a natural neutral sentence, especially in a practical or instructional context, like describing the next step in a process.

Hungarian word order is flexible and depends a lot on topic and focus, not just grammar. Starting with the verb here can sound like:

• We bleed the radiator
• Next, we bleed the radiator

If you say A radiátort légtelenítjük, that is also correct, but it puts more attention on the radiator as the topic.

Not exactly.

Légtelenítjük a radiátort is indicative: we bleed / we are bleeding the radiator.

If you want Let’s bleed the radiator, Hungarian normally uses the imperative/subjunctive:

• Légtelenítsük a radiátort.

That is an important difference:

• légtelenítjük = we do it
• légtelenítsük = let’s do it

Very roughly, it sounds something like:

LAYK-teh-leh-NEE-ttyük

A few useful points:

• Hungarian stress is always on the first syllable: LÉG-
• é is a long vowel
• the g in légt- is affected by the following t, so it sounds closer to k
• tj in -ítjük is pronounced together, roughly like a soft long tty

So the spelling and pronunciation are not completely one-to-one here, which is normal in Hungarian consonant combinations.

It is a loanword, and it looks very similar to English radiator.

That makes it easy to recognize, but remember that Hungarian still treats it like a normal Hungarian noun:

• it takes Hungarian case endings: radiátort
• it takes Hungarian articles: a radiátor
• it follows Hungarian stress rules: stress on the first syllable

So even familiar-looking international words behave in a fully Hungarian way once they are in the sentence.