Fast sharp clicking sound only when AC compressor comes on. 2025 4Runner SR5.

[Goldberg1_21]

Hello, has any one come across a loud fast repetitive clicking sound when AC compressor comes on.

The dealership says it’s Direct Injection sound, but I am like why only when AC comes on.

it stop and goes as the compressor engages and disengages and more prominent when in drive or reverse gear.

 

[Trail4R]

Direct injection systems indeed have a characteristic ticking or clicking sound from the injectors, but they usually don't become noticeably louder when the AC comes on. Weird.