humming sound as if something is on after the car is off

Asked by Marde Jul 01, 2018 at 09:26 PM about the 2000 Nissan Maxima SE

Question type: General

i have a 2000 nissan maxima se 3.0l. theres a humming sound
coming from the front of the car when the car is shut off. sounds
like something is on, but nothing is moving. both fans arew of.
after the engine is cooled off and the sound is still going ill feel
around to see if i could feel where its coming from and no luck

1 Answer
43,860

Hornet_2497 answered 6 years ago

If you have been running the A/C, that hissing sound is refrigerant boiling and gurgling. That is normal and most people aren't observant enough to even notice. This sound will occur in the evaporator and the condenser just after the engine is turned off and lasts only a minute or two.

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