Strange buzzing sound from cabin

[Memphis_Jeff]

2002, 271k miles.

The part in this photo with the little yellow sticker started buzzing about a month ago. If I knew what the part was, I could diagnose and fix it but don't know where to start. Can someone simply tell me what this is and why is it buzzing?

 

[raKnizek]

If this is a Limited model I would imagine that is an actuator for the automatic climate control (for controlling where the air is directed)

 

[Jeffh1988]

I have a 1999 with auto climate and that part is called or at least from what I understand is the blend door actuator. It's simple to remove just a few fasteners hold it in. And it has a big gear inside that strips out. If this is the problem like it was with mine all you do is take it apart flip you gear around 180° and use the un used side. Try that out and get back to use.
Thanks
Jeff h

 

[RoofRack]

Could be something rattling around in the HVAC fan. If that's under that thing. Can't quite tell from the image. Pull the screws and empty it out. It's pretty simple if that's what it is.

-M

 

[Memphis_Jeff]

Thanks Jeffh, looks like a blend door actuator, never knew what that was. The Haynes manual has nothing on it. I hate just unfastening things without a guide but sounds like its easy to flip that gear with minimal trouble. Also, an awkward place to get at. Thanks for the lead. I will take some photos and post when I tackle it.

 

[curryT4R]

Thanks Jeffh, looks like a blend door actuator, never knew what that was. The Haynes manual has nothing on it. I hate just unfastening things without a guide but sounds like its easy to flip that gear with minimal trouble. Also, an awkward place to get at. Thanks for the lead. I will take some photos and post when I tackle it.

It's either a air mix servo motor, or the mode select servo motor.

Try changing the temperature and if it makes the noise then it's air mix, but if you change the mode (face, floor, defrost) and it makes the noise then it's the mode select servo motor.

 

[Memphis_Jeff]

Found this, last post looks like what I need:

http://www.toyota-4runner.org/3rd-gen-t4rs/183759-blend-door-actuator-stuck.html

 

[Hidjet]

That is the blend door actuator for the automatic climate control. I purchased a new one a few years ago after mine went all haywire. Before I bought the new one I did the "flip over the gear method". That lasted a while but now I'm just going to replace it all together.

Im doing that repair now, tho I have that on pause at the moment in hopes of finding a solution to my sticky/hard to move cables. I asked the local Toyota dealer about a recommendation as to what products to use, but that was hopeless.

I am still searching for a suitable product and procedure as I would like to make those cables move a bit more freely before I slap in the new actuator and my sticky cables causing this problem all over again.

 

[96Runr]

Maybe your rig is pretending to be a ‘96 with the buzzin

 

[19963.4lsr5]

That is the blend door actuator for the automatic climate control. I purchased a new one a few years ago after mine went all haywire. Before I bought the new one I did the "flip over the gear method". That lasted a while but now I'm just going to replace it all together.



Im doing that repair now, tho I have that on pause at the moment in hopes of finding a solution to my sticky/hard to move cables. I asked the local Toyota dealer about a recommendation as to what products to use, but that was hopeless.



I am still searching for a suitable product and procedure as I would like to make those cables move a bit more freely before I slap in the new actuator and my sticky cables causing this problem all over again.

Cable lube for dirt bikes should work. And there is a rubber gizmo to aid in spraying/getting the lube into the cable jacket.


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[Memphis_Jeff]

That is the blend door actuator for the automatic climate control. I purchased a new one a few years ago after mine went all haywire. Before I bought the new one I did the "flip over the gear method". That lasted a while but now I'm just going to replace it all together.

Im doing that repair now, tho I have that on pause at the moment in hopes of finding a solution to my sticky/hard to move cables. I asked the local Toyota dealer about a recommendation as to what products to use, but that was hopeless.

I am still searching for a suitable product and procedure as I would like to make those cables move a bit more freely before I slap in the new actuator and my sticky cables causing this problem all over again.

In this message: http://www.toyota-4runner.org/3rd-gen-t4rs/183759-blend-door-actuator-stuck.html

... look at the thirteenth post. You might find some guidance.

 

[Hidjet]

Ya I read through that post as well. I was hoping others out there had any more suggestions and or experiences lubing up the cables and linkages.

I just picked up some TriFlow lubricant today. It is a teflon base, so similar product. I am going to head out and clean all the gunk from the linkages and cables, and apply some of this TriFlow to everything a few times.

Ok well the TriFlow worked well. I'm going to start a thread of my repairs for those interested.

 

[Jeffh1988]

I ended up taking my truck to a shop to get my a/c looked over. Replaced my a/c compressor and dryer. Took a lot of money to get done. Got in the truck started it up and it was cooler but not cold. So I thought well it is 113° right now so drove it the long way home and it still wasn't blowing cold air. So I parked it and be van thinking to myself why won't it be cold. Then I just went out and took the servo motor out pull the valve/door to the one side then went to the coolant slide and closed that off and put my temp gun to it and it was blowing 39° so happy and now it is worth the money I spent. So if anyone has a problem with their a/c check into these two things because it might be doing what mine was and putting that coolant threw the heater core.