406oc.co.uk

im getting a low-pitched whining noise from the bulk head Area when the car is cold,
it runs for about 3mins then goes,
anyideas what it is,
couid this be booster or run on pump for the heater ? Do 406s have them ?

its been bugging me for a while now just thought id ask to see if its normal

thanks inadvance,

(99 (V) 406 110 hdi, )

could be the ac pump

FarmerPug wrote:could be the ac pump

Theres no Air- con on mine farmer-p,
iremoved the pump as it kept snapping the v-belt, its all been replaced with another pulley set-up,
IDont miss the Air-con and its less weight

the crankshaft pulley is known for a bit of a noise.

FarmerPug wrote:the crankshaft pulley is known for a bit of a noise.

the noise is coming from behind the dash/bulkhead, it sounds like a little motor or run on pump,
the noise disapears after a min or 2 depending on how cold it is outside ,

theres something for the brakes that makes a noise for about 2 minuites when the cars switched off.

FarmerPug wrote:theres something for the brakes that makes a noise for about 2 minuites when the cars switched off.

its deffo heater related

iwill find out what it is one day when i pull a few wires

when you press the air recirculation button does the sound change pitch ? or does any change happen when u press that button

my money is on the air recurculation flap motor

Gary406 wrote:when you press the air recirculation button does the sound change pitch ? or does any change happen when u press that button

my money is on the air recurculation flap motor

nope no change.
its related to the heater because when the engine is cold it does this & when the car as been used /run it doesent and it wont do it again till the temp is realy cold ,

it doesnt do this on warm days either,

my old ford galaxy used to do this as it had a booster for the heater & a run on pump but ididnt think pugs had this hence why ifind it strange it making this low-pitched humming noise,

my money is still on the motor for the air re-circulation flap,

take the glove box out - 5 min job, and unplug the motor see if the noise stops,,,

ah sometimes the actual heater motor can squeak a bit in the cold, turn it up to full blast.

oh ye could be that , im sure the fans even spin slowly even when its turned off

no the fan usually turns off when the keys out, the only low pitched noise from the bulkhead is that thing for the brakes, push the pedal quickly a few times and it goes quiet.

right o,

had another look the noise isnt coming from inside the car its coming from under the bonnet Middle of the car -bulkhead area, but what ever it is -it must have links to either the coolant or the heater as it dont make this humming whinning noise when either the car is warm or the Weather is,

the pump for the diesel