Ac unit WHISTLES when turned on

Anyone exsperience this whistling?

 

Usually low return airflow....start with the cabin air filter see if plugged up.

 

Are all the dash vents open?

 

No. Really nothing that simple. Checked those off. Coming from comp i am affraid. Since day one. I thought it was low trans. Fluid till i discovered it happen when ac unit was imployed

 

Does it know any good tunes?

Mine gives sort of an occasional harmonic hum when the truck is pulling a load/accelerating on a hot day. Ive heard others say the same. Its weird, but from what Ive heard, normal.

 

Yes, cool enough to freeze you out

 

https://www.tacomaworld.com/threads/3rd-gen-tacoma-a-c-noise.550627/

 

This.
I’ve had seven cars from five different manufacturers in my short adulthood so far. Every single one of them had an ac or a pulley that squeaked or whistled at certain times and under certain circumstances. Unless it’s a steady nonstop issue that’s harming functionality or reliability I would say forget it

 

does it sound like this ?https://youtu.be/UIz4ftlhTeA

 

I have so many questions

But first

How old are you and why are you watching peppa pig

 

Safe to assume you don’t have kids?

 

That would be correct

But if I did

They would still never watch peppa pig

 

Known issue. It's a design quirk. Has something to do with the compressor output (tied to engine RPM) and the expansion valve needle position (tied to heat load on the evaporator). There's a certain combination of the two that causes the whistle, which is likely just the expansion valve needle 'ringing'.

You can minimize or eliminate it by turning recirculate on. Once the cab cools down a bit, the noise should go away or be much quieter.

 

Peppa pig is great though..

 

I get a whistling sound if the passenger vents are completely closed.