Noise from behind dash
#1
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Guys,
I have a noise coming from behind the dash when I first start the vehicle. It typically lasts about 15-20 seconds. Originally thought it was the heater core, but that would always make the noise. Then I thought blend door actuators but it happens regardless if the climate control is on or not. I was wondering if it was coming from the NAV screen but it continues way after the nav door opens and gets to the correct position. It's kind of hard to describe the sound, kind of a mixture between a heater core bubbling and a creaking noise. I tried to record it but it wasn't loud enough to capture. Any ideas?
I have a noise coming from behind the dash when I first start the vehicle. It typically lasts about 15-20 seconds. Originally thought it was the heater core, but that would always make the noise. Then I thought blend door actuators but it happens regardless if the climate control is on or not. I was wondering if it was coming from the NAV screen but it continues way after the nav door opens and gets to the correct position. It's kind of hard to describe the sound, kind of a mixture between a heater core bubbling and a creaking noise. I tried to record it but it wasn't loud enough to capture. Any ideas?
#2
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Could be the power brake pump or power steering pump pressurizing the systems. Those noises are normal for a few seconds.
The brake pump comes on as soon as you turn on the car (without starting the engine).
Neither noise should be loud.
The brake pump comes on as soon as you turn on the car (without starting the engine).
Neither noise should be loud.
#3
Lexus Test Driver
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Check this thread on HVAC actuator noise
please let us know if this is the noise
https://www.clublexus.com/forums/sc4...l#post10862800
please let us know if this is the noise
https://www.clublexus.com/forums/sc4...l#post10862800
#4
Lexus Test Driver
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Or is it this noise?
this is the Brake Master Cylinder
this is the Brake Master Cylinder
#5
Lexus Test Driver
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Go to posts 3, 9 and 10 in this thread...
is this the noise you hear?
https://www.clublexus.com/forums/sc4...from-dash.html
is this the noise you hear?
https://www.clublexus.com/forums/sc4...from-dash.html
#6
Pole Position
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I am Voting for the Blend Door. I think the system checks their position even if the HVAC system is off. Also, your gut instinct was the heater core, which is really close to the blend door motor.
BGW is a genius though, so you definitely want to check out his recommendations. If I post 5,020 more posts, I will finally catch up with him. (And only 9000 posts to catch up with you)
BGW is a genius though, so you definitely want to check out his recommendations. If I post 5,020 more posts, I will finally catch up with him. (And only 9000 posts to catch up with you)
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Bgw70 (11-17-20)
#7
Lexus Test Driver
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I am Voting for the Blend Door. I think the system checks their position even if the HVAC system is off. Also, your gut instinct was the heater core, which is really close to the blend door motor.
BGW is a genius though, so you definitely want to check out his recommendations. If I post 5,020 more posts, I will finally catch up with him. (And only 9000 posts to catch up with you)
BGW is a genius though, so you definitely want to check out his recommendations. If I post 5,020 more posts, I will finally catch up with him. (And only 9000 posts to catch up with you)
The following users liked this post:
DshngDaryl (11-17-20)
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#8
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Thank you all for taking the time to respond. I haven't had an opportunity lately to mess with this. I replaced the antenna which was making a terrible noise so I am sure now it will be a little easier to pinpoint this noise we are discussing. It's either related to stereo/nav or a blender door. I need to play around with the controls for both and try to work out which it is. I am leaning toward NAV/stereo right now as I haven't noticed any issues with heat/ac not working or blowing through the chosen vents. Will update shortly. Thanks again!
#10
Lexus Test Driver
#11
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Say I had access to Lexus service bulletins. If I did, and your noise isn't blend door or any other documented cabin noises, hypothetically I could share an instruction document regarding windshield stopper set screw intermittent rattle.
Hopefully you figure it out. UINs are annoying.
Hopefully you figure it out. UINs are annoying.
#13
Lexus Test Driver
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you can purchase these actuators from Rockauto for $50-$100 or repair them for $5
https://www.rockauto.com/en/catalog/...actuator,10721
this repair video is similar to the SC430…it’s really not that difficult
Last edited by Bgw70; 07-18-21 at 09:25 AM.
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