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Old 09-23-2022, 01:46 PM #1
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Anyone recognize this sound?

I have a 2007 4Runner that recently started making a very odd sound. I believe it’s coming from the engine compartment but it’s best heard from inside the cabin on the passenger side while the vehicle is running. The sound does not exist when the engine is turned off. Here is a link to the sound, any ideas?

odd sound
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Old 09-23-2022, 02:36 PM #2
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My 4R made this noise when I first got it, and it drove me crazy. Over time it evolved into a buzzing noise, and now I have bad HVAC actuator(s) in my truck and I sometimes get stuck on defrost. I have been told blend door actuator, but haven't had time to diagnose. How's your climate system working?
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Old 09-23-2022, 02:58 PM #3
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I don't know, but mine makes the same clicking sound like that. Not all the time. At first I thought it was an animal, but it also only happens to me when car on, not off. I am guessing it's HVAC related. I also get an intermitted squeaking noise from the blower that I can get to go away by cycling from defrost to floor vents. Try cycling all your blowers through each setting. I haven't heard it in my car for a while, but it will come back eventually, then go away so it has to be related to a setting or condition of some system in the vehicle that changes.
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Old 09-28-2022, 03:31 PM #4
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I think it's HVAC related too. Or a mouse writing on a typewriter... You decide.
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Old 09-28-2022, 03:47 PM #5
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Mine did it today for the first time in a long time. I had switched my HVAC from Auto to low fan, and set the vents to defrost and floor. I heard the sound at a stop light. I cycled the HVAC through all the vent options and it went away. So it must be something loose, or maybe some actuator or motor not reaching the state it should be in so the logic keeps trying to actuate its control mechanism.
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Old 09-28-2022, 06:21 PM #6
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I would get inside the blower squirrel cage via the glove box to rule out something rattling around in there.
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Old 09-29-2022, 04:02 PM #7
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Thanks all for the replies. Iíve been messing with the HVAC and havenít yet been able to perfectly correlate the sound with any specific setting. Right now itís just in ďinconsistentĒ territory.

How do I get inside the squirrel cage? Is that next to the mouse typewriter?!
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Old 09-29-2022, 04:25 PM #8
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i think it is the sound of money running on tiny legs from your pocket to your mechanics!
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Old 09-29-2022, 04:51 PM #9
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Originally Posted by keylay31 View Post
Thanks all for the replies. Iíve been messing with the HVAC and havenít yet been able to perfectly correlate the sound with any specific setting. Right now itís just in ďinconsistentĒ territory.

How do I get inside the squirrel cage? Is that next to the mouse typewriter?!

2016 Toyota 4 Runner Blower Motor Problems / Fixes - YouTube
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Old 09-29-2022, 06:01 PM #10
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sounds like the air recirculate flap trying to open or stay closed. mine makes a noise and ill open and close it and its stops.
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Old 10-16-2022, 10:43 PM #11
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Any chance it could be boiling coolant in the heat exchanger? This was a suggestion of my neighbor who is not a mechanic but seems to know more than me.
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Old 10-19-2022, 04:37 PM #12
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Quote:
Originally Posted by swo life View Post
I don't know, but mine makes the same clicking sound like that. Not all the time. At first I thought it was an animal, but it also only happens to me when car on, not off. I am guessing it's HVAC related. I also get an intermitted squeaking noise from the blower that I can get to go away by cycling from defrost to floor vents. Try cycling all your blowers through each setting. I haven't heard it in my car for a while, but it will come back eventually, then go away so it has to be related to a setting or condition of some system in the vehicle that changes.
Blend door actuator? Maybe?
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Old 10-21-2022, 12:35 PM #13
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subscribed. I have a similar sound.
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Old 12-14-2022, 05:21 PM #14
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Does anyone have instructions for how to take apart the passenger side dash so I can investigate this further? Would be nice to not just start removing bolts.
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Old 12-14-2022, 07:34 PM #15
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Does anyone have instructions for how to take apart the passenger side dash so I can investigate this further? Would be nice to not just start removing bolts.
Did you rule out the blower motor and/or debris in the fan cage?

Instructions were linked in post #9

Last edited by 5thToy; 12-15-2022 at 01:25 AM.
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