High pitched tone

ezaircon4jc · 04-09-2021, 10:52 PM

I put this here because it's in the engine compartment. Anyone have any idea what this tone is? The dealer and I have been trying to chase this down for just over 3 years. They can't duplicate as it's quite intermittent.

AnotherM · 04-09-2021, 11:26 PM

Is it heard when the car is hot and just turned off?

ezaircon4jc · 04-09-2021, 11:47 PM

Quote:

Originally Posted by F10c550i

Is it heard when the car is hot and just turned off?

VERY bizarre scenario... Been out driving engine bay hot. Once cool air, like when I open the garage door, hits the bay, the noise starts. Close door, noise stops. Open door, starts again. This can happen 1 hour after arriving home or 3 hours, there is no rhyme, reason or consistency.

AnotherM · 04-09-2021, 11:50 PM

Quote:

Originally Posted by ezaircon4jc

VERY bizarre scenario... Been out driving engine bay hot. Once cool air, like when I open the garage door, hits the bay, the noise starts. Close door, noise stops. Open door, starts again. This can happen 1 hour after arriving home or 3 hours, there is no rhyme, reason or consistency.

On the n63 we have an auxillary coolant pump that runs when the car is off. Not sure if you have one. I would imagine if the pump was seized it would make that noise.

ezaircon4jc · 04-10-2021, 12:04 PM

Quote:

Originally Posted by F10c550i

On the n63 we have an auxillary coolant pump that runs when the car is off. Not sure if you have one. I would imagine if the pump was seized it would make that noise.

If I had one and were it seized it wouldn't last 3 years. I would imagine I would have overheating issues also.

AnotherM · 04-10-2021, 01:30 PM

Quote:

Originally Posted by ezaircon4jc

If I had one and were it seized it wouldn't last 3 years. I would imagine I would have overheating issues also.

I would agree except the auxiliary pump has no effect on overall cooling. It only cools the DME and circulates coolant when the engine is off.

All i can say is the noise sounds like a seized pump to me. I am comparing it to pumps i come across at work which are pool pumps, pond pumps, and irrigation pumps.

ezaircon4jc · 04-10-2021, 06:48 PM

Quote:

Originally Posted by F10c550i

I would agree except the auxiliary pump has no effect on overall cooling. It only cools the DME and circulates coolant when the engine is off.

All i can say is the noise sounds like a seized pump to me. I am comparing it to pumps i come across at work which are pool pumps, pond pumps, and irrigation pumps.

Wouldn't the sound always be there?

ezaircon4jc · 04-10-2021, 07:43 PM

Oh yeah; the sound comes from the drivers side, down by and just forward of the throttle body.

04-09-2021, 10:52 PM	#1
ezaircon4jc Major General 4484 Rep 5,366 Posts Drives: 2019 540i M Sport Join Date: Jan 2015 Location: San Diego iTrader: (0)	High pitched tone I put this here because it's in the engine compartment. Anyone have any idea what this tone is? The dealer and I have been trying to chase this down for just over 3 years. They can't duplicate as it's quite intermittent.
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04-09-2021, 11:26 PM	#2
AnotherM Cole 321 Rep 498 Posts Drives: 2016 m5 CP Join Date: Oct 2020 Location: AZ iTrader: (0)	Is it heard when the car is hot and just turned off?
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04-10-2021, 07:43 PM	#8
ezaircon4jc Major General 4484 Rep 5,366 Posts Drives: 2019 540i M Sport Join Date: Jan 2015 Location: San Diego iTrader: (0)	Oh yeah; the sound comes from the drivers side, down by and just forward of the throttle body.
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