Buzzing noise

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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caprixpack
1.8 16v
Posts: 95
Joined: Sun Mar 11, 2018 5:00 pm
Location: Cumbria

Buzzing noise

Post by caprixpack » Wed Apr 04, 2018 10:12 pm

There's a rather loud buzzing noise coming from behind the dash on the drivers size of the GTX. It doesn't always happen, at first I thought it might have been the radiator fan but it's not and it can't be heard outside of the car only from inside. Any ideas?
1984 924 2.0 n/a crystal Green - The daily
2005 VW Passat tdi 130 Highline, now 170bhp & 290ft/lb
2000 Peugeot 406 2.0 hdi - stood for 4 years, fresh mot and mostly working.

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GingerMagic
3.0 24v
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Location: Bournemouth

Re: Buzzing noise

Post by GingerMagic » Wed Apr 04, 2018 10:20 pm

Is it definitely the drivers side?
There is a recirculation motor that sits behind the dash but nearer the glovebox side - this has been known to make a racket when its opening the fresh air flap, some of them have ruined cogs where the flap has been jammed for years and its stripped the teeth off..!

When I bought my 2nd 406 ( ex-taxi, eBay purchase, many issues :frown: ) the fresh air flap had to be broken off as it was stuck solid, you can only imagine the smell in that car when I first got it....
1999 T4 family wagon, slow as a turd but the kids like it
2002 Citroen Xsara Picasso Hdi90 - Dirtied by the kids, Dented by the wife....
Sadly sold the 406, best cars I have ever owned
PP2000 user, can help with faults / diagnostics in the Bournemouth area.

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Doggy
Mod with a 2.2 HDi, De-Fapped!
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Re: Buzzing noise

Post by Doggy » Thu Apr 05, 2018 12:40 pm

I was thinking the same thing, (recirculating flap gubbins).

Another possibility you get with 110's of that age is a buzzing noise from the bulkhead area that typically lasts for maybe 15-20 seconds after stopping the engine, (I think it comes from one the vacuum solenoids that control the egr/wastegate/air doser)
2003 HDi 2.2 6-speed Exec Estate

caprixpack
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Location: Cumbria

Re: Buzzing noise

Post by caprixpack » Thu Apr 05, 2018 2:32 pm

The noise stops as soon as you turn off the engine. It seems to come and go sometimes only on for a few minutes other times it lasts for 10 to 15 minutes. Strangely it can't be heard in the engine bay and after a bit more listening it seems to be coming more from the middle of the dash.
1984 924 2.0 n/a crystal Green - The daily
2005 VW Passat tdi 130 Highline, now 170bhp & 290ft/lb
2000 Peugeot 406 2.0 hdi - stood for 4 years, fresh mot and mostly working.

PeterN
3.0 24v
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Location: Charmouth, Dorset

Re: Buzzing noise

Post by PeterN » Fri Apr 06, 2018 10:22 am

It will probably be a heater flap motor. The temperature one is pretty active most of the time, try changing the temperature when its doing it - or not doing it. If its not that could be another flap motor stacking.

Peter

caprixpack
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Posts: 95
Joined: Sun Mar 11, 2018 5:00 pm
Location: Cumbria

Re: Buzzing noise

Post by caprixpack » Fri Apr 06, 2018 10:24 am

OK cheers I'll give it a go next time I'm out in it.
1984 924 2.0 n/a crystal Green - The daily
2005 VW Passat tdi 130 Highline, now 170bhp & 290ft/lb
2000 Peugeot 406 2.0 hdi - stood for 4 years, fresh mot and mostly working.

dirtydirtydiesel
3.0 24v
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Location: Coalville, Leics.

Re: Buzzing noise

Post by dirtydirtydiesel » Sat Apr 07, 2018 11:36 pm

It's easy to check the flap, pop out the pollen filter & whilst looking down the hole under the pollen filter aperture
Get a assistant to press the recirculate button you should see the flap open & close if all is well.
Obviously with the ignition on.
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power :cheesy: )
1999 3.0 V6 SE coupe in Diablo Red ( my baby )
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley :roll: )

pp2000 owner / user, can offer Diagnostic's / fault code, reading / clearing for beer tokens in Leicestershire.

frog
2.0 16v
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Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Buzzing noise

Post by frog » Mon Apr 09, 2018 7:05 am

dirtydirtydiesel wrote:
Sat Apr 07, 2018 11:36 pm
Obviously with the ignition on.
And engine must be running 8)
caprixpack wrote:
Thu Apr 05, 2018 2:32 pm
other times it lasts for 10 to 15 minutes.
The recirculation flap motor is not operated for this long, at most ~ 10-20 seconds... Probably it's a temperature flap motor as PeterN suggests. Also because you hear it from the middle of the dash, that is where they are. There are two of these temperature flap motors:

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Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.

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