What's that Whistling noise

I noticed my truck making a whistling noise with windows down a couple weeks ago. Today this whistling noise was louder. I could hear it with the windows up and down. I tried placing my arm all around the outside of my truck while driving but could not get it to stop. I now some have a goose like noise resolved with new weather stripping around the door. But this is a whistle noise. Anybody experience this.

 

Look at the bottom of the lower control arms. If there are open holes, that's likely causing it. Take it to the dealer and they'll take care of it with some plastic plugs.

 

Or it's this https://www.tacomaworld.com/threads/2018-tacoma-off-road-a-c-noise.550627/

 

A/C on or off? I have the A/C whistle and it’s annoying as hell.

 

my ac howled a few times, but i couldn't replicate it after that span of like 20 minutes. Compressor might be going bad or something

 

check your cabin air filter area. I've had leaves get in there and cause some whistling noises at times. otherwise the crosswind noise TSB is also a cause of the whistling. don't really need to go to a dealer for it though. can buy the plugs referenced in the TSB (or get similar size at a hardware or auto store) and plug them yourself for a few bucks. was much easier than dealing with the dealer for something so simple