Air outlet noise

[4Run14]

'14 SR5 Prm

20 degrees. This morning as my vehicle was warming up I changed the air outlet from blowing heat to the main area to blowing down to the floor. When I did this I heard some buzzing which lasted 4-5 seconds and it was coming from behind the dash. So I tested it out. I kept switching it from one to another, back and forth...same noise was heard.

After 5-10 minutes of driving the noise finally went away. Is this normal?

 

[philsey]

Check your cabin air filter.

 

[adam2562]

sounds like the servo has an issue.. usually this only tends to happen on high mileage cars. have the dealer check it out.

 

[4Run14]

I only have 3k miles. I just don't want to make an unnecessary trip to the dealer if it's normal.

 

[1engineer]

Sounds like a piece of dried leaf in the cage.

 

[rigtec]

"After 5-10 minutes of driving the noise finally went away. Is this normal?..."

Hi 4Run14,

There may be a pneumatic servo (w/linkage, blend doors...etc) in the dash that is noisy due to lack of use and radical temp changes. Continue to exercise the climate control system and allow the control modules to 'break-in'; the sound should become less noticeable across time. rgds!

rigtec, cheers

 

[gm350reratliff]

sounds like the servo has an issue.. usually this only tends to happen on high mileage cars. have the dealer check it out.

This^^^

Does the 4runner use pneumatic or electric servos for the HVAC blender doors?

 

[Antman]

My bet is on a leaf as well.

 

[4Run14]

So far I haven't heard it come back and it did get really cold here recently.

 

[adam2562]

So far I haven't heard it come back and it did get really cold here recently.

when they do start to go bad, it starts in the real cold weather then a yr or so down the road it'll do it all the time.. mine had went out in my lexus.. sounded like mice scratchin' back there.. if it goes away and never comes back, it was probably a leaf

 

[4Run14]

when they do start to go bad, it starts in the real cold weather then a yr or so down the road it'll do it all the time.. mine had went out in my lexus.. sounded like mice scratchin' back there.. if it goes away and never comes back, it was probably a leaf

Thanks

 

[3wbdriver]

Make a note and have them check it during your 5k service.

 

[4Run14]

Make a note and have them check it during your 5k service.

I'm pretty sure you meant 10k.

 

[Swarty]

You're wasting OPs time telling the dealer to check it. If he can't make it happen for them they won't do anything.

 

[badhabits]

I'm pretty sure you meant 10k.

Your Toyota care service intervals are at 5k. They change oil at 10k but do a general service on the 5k intervals.

 

[4Run14]

It just happened again this morning. Seems as if if it sits overnight in the cold garage it keeps happening.

 

[4Run14]

Your Toyota care service intervals are at 5k. They change oil at 10k but do a general service on the 5k intervals.

The dealer might, but I normally avoid them charging me for things I can look at myself.

 

[meltdown]

4Run14, maybe you could use you're cell phone and try catching the sound on video. Show it to the service tech when you go to the dealer. Posting it on here may aid the forum in helping as well.

 

[4Run14]

4Run14, maybe you could use you're cell phone and try catching the sound on video. Show it to the service tech when you go to the dealer. Posting it on here may aid the forum in helping as well.

I can definitely try that in the morning. I'm not sure how well the sound will come in though and where exactly I should hold the phone.

 

[4Run14]

https://vimeo.com/112059103

Here's a video of how it sounds.