high pitched whistle

johnsteele · May 10, 2015

just coming home on the motorway and all of a sudden heard a high pitched whistling noise from behind the dash? tried the heater hot an cold all directions it was fine so i pulled over and tried the suspension up and down it was fine so i turned off the ignition and after about 20 seconds the whistle came to a reducing stop. started up it was fine no whistle. any ideas?

dolphinboy · May 10, 2015

I would suspect it is your centre aircon vents. They are controlled by the blue/red dial. Trying cycling the feet/face/screen buttons. It could be they are just getting a bit sticky and not opening the vents behind the facia fully.

robhew86 · May 10, 2015

johnsteele said:
just coming home on the motorway and all of a sudden heard a high pitched whistling noise from behind the dash? tried the heater hot an cold all directions it was fine so i pulled over and tried the suspension up and down it was fine so i turned off the ignition and after about 20 seconds the whistle came to a reducing stop. started up it was fine no whistle. any ideas?

Adjust the fan speed next time, try switching it off see if the noise goes.
Not un-Common for the interior fan to make strange noises.

MrGorsky · May 10, 2015

Consider low aircon refrigerant.

I had a (really) high pitched whistling from behind the dash. Dogs and those with young ears could hear it.

It was the pressure reducing valve for the aircon, caused by low refrigerant, caused by a pin hole in the aircon condenser releasing my precious refrigerant to the atmosphere.

This was on a P38, but the effect might be the same.

johnsteele · May 11, 2015

robhew86 said:
Adjust the fan speed next time, try switching it off see if the noise goes.
Not un-Common for the interior fan to make strange noises.

at the time when the wistle started the fan was off aircon was off. i turned them on to all positions and temperatures and it made no difference. it even carried on when the engine was switched off

johnsteele · May 11, 2015

MrGorsky said:
Consider low aircon refrigerant.

I had a (really) high pitched whistling from behind the dash. Dogs and those with young ears could hear it.

It was the pressure reducing valve for the aircon, caused by low refrigerant, caused by a pin hole in the aircon condenser releasing my precious refrigerant to the atmosphere.

This was on a P38, but the effect might be the same.

i have had trouble with the air con in the past. i have recently replaced the condenser. i tried the air con on the rest of the journey and it worked fine freezing infact

Saint.V8 · May 11, 2015

The HEVAC control unit has a small fan in the fascia that draw cabin air over a small sensor.....these small fans run on few a few minutes on engine and ignition off.....
They have been known to get noisy if there is fluff or dust caught in it.

johnsteele · May 11, 2015

Saint.V8 said:
The HEVAC control unit has a small fan in the fascia that draw cabin air over a small sensor.....these small fans run on few a few minutes on engine and ignition off.....
They have been known to get noisy if there is fluff or dust caught in it.

any ideas of how to get to it ant is it behind the control buttons its worth a check but the whistle was more like a kettle quite loud

Thats Bollocks · May 11, 2015

johnsteele said:
any ideas of how to get to it ant is it behind the control buttons its worth a check but the whistle was more like a kettle quite loud

I've had the same! It's definitely an electrical type whistle( buzzer etc) no
Idea had it happen to me about 4 times in 4 years!
No idea what the hell it is?

high pitched whistle

johnsteele

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dolphinboy

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robhew86

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MrGorsky

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johnsteele

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johnsteele

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Saint.V8

Dyed-in-the-wool 100% RR Junkie

johnsteele

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Thats Bollocks

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