Hello,just replaced blower resister have air flow now however can't turn it completely off sounds like a flap door keeps recycling on top under dash.Thanks in advance.

The blend and defroster doors will never completely stop air flow. However, if the outside air door is closed (faulty installation or operation), and the recycle door is also closed, no air flow. Both these door actuators should be carefully checked to make sure they are installed and working properly.
Another unusual condition would be the air inlet passage is blocked by debris or ice.

When you turn on fan,is air coming out of vents normal but not getting hot or cold.If no air is coming out,then blend door is shut,causing air to back up and maybe cause that noise,here are 2 links on how to replace blend door and blower motor,join the A.Z.site,at top right hand corner of page,it's so free,then you can use their repairs like me.I just had my evaporator replaced,it was clogged up,a mouse made a home in the box that holds it,air is suppose to go thru it,but it backed up and made a noise,had midas repair,cause freon had to be removed to replace part,it's located next to blower,your blend door flap is probably broken,just stays closed.

Try starting the truck so it makes the noise.
Then switch the air control to "fresh".
If noise stops, it is probably the motor that closes flap to recycle the cab air.
It would be found under the dash, under the glove box, & would need to be replaced.

Hello: To replace the "squirrel cage" you have to replace the complete blower motor.

The ductwork has flaps they call doors. These change the flow of the air from DEF to VENT and FLOOR and so on. The vacuum controlled flaps may hang up or lose the vacuum over a period of time.

When you start the car vacuum is created and the flap actuators return to the last settings. This is the sound you hear.

flow of air has nothing to do with the AC unless a blend door is jamming or the fan motor is slowing down. Their is a blower resister that is replacable if its a blower issue.

1. REMOVE GLOVE COMPARTMENT DOOR

2. REMOVE ENGINE (and ECT) ECU
(a) Disconnect the wire harness clamps.
(b) Disconnect the connectors.
(c) Remove the 2 bolts and engine (and ECT) ECU.
3. Two way flow heater models only:
REMOVE AIR DUCT (Motor cover)
(a) Disconnect the control link.
(b) Disconnect the connector clamps.
(c) Remove the screw.
(d) Release the claw and remove the air duct.
4. REMOVE BLOWER RESISTOR
(a) Disconnect the connector.
(b) Remove the 2 screws and blower resistor.
5. INSPECT BLOWER RESISTOR RESISTANCE
Tester connection Condition Specified condition
1 − 3 Constant Approx. 0.4 ω
1 − 2 Constant Approx. 1.5 ω
1 − 4 Constant Approx. 2.8 ω
If resistance is not as specified, replace the blower resistor.
6. INSTALL BLOWER RESISTOR
7. Two way flow heater models only:
INSTALL AIR DUCT
8. INSTALL ENGINE (and ECT) ECU
9. INSTALL GLOVE COMPARTMENT DOOR

2 fixes - read on - one quick and one long and hard
(little tip - take pics (camera phone) rather than try and remember how it should all go back together)

the knocking is a motor and gears that move the fresh air/recycle flap - it is up behind the dashboard behind the glovebox
the problem is that the gears wear and become misaligned
the flap then can not open fully, its doesnt reach its end stop which switches the motor off
so the motor keeps going the and the gears keep clicking over

the big cylindrical thing you are seeing is the blower motor - it should have a red and a black wire going to it

1. quick fix first
remove the wires to the blower motor
undo the 3 brass coloured cross head screw from around the blower motor
remove the blow motor and fan
turn on the ignition and put the air flow to fresh air (i.e not recycle)
the knocking should start
lay on your back with your head i the footwell
with torch and hands locate the motor/gears that are knocking
find the wires to the motor and remove or cut them (if cutting turn the ignition off first !!!)
make sure the flap is in the open position, tape,jam or wire it open (who uses the recycle position anyway ??)

2. long hard fix
remove the blower motor as described above
this leaves the fan casing
from the engine bay remove the plastic cover from the top where the windsceen wiper motor is (just below the windscreen)
depending on model you may have the engine management CPU on the right handside - this may need removing
on the right hand side there will be 3 (maybe 4) bolts just above where the fan housing is
undo these - note i have seen these with the bolt head in side the car and some with the bolt head on the engine side - dont know why ???
if they are inside the car - you need to remove air trunking, repostion wires and get a long thin socket extension and some flexible bit to be able to get a socket on the head.

once all this is out - locate the motor/gear making the noise (as above)

remove the motor wire and after removing any more obstructing object remove the motor and gears- you will need to be very flexible and have a good range of flexi and rightangle drive socket bits

now all you need to do is purchase the new gears (if peugeot have any) rebuild it all and refit, then put everything back as you found it

shouldnt take more than a day or two, or a finger or two

can you hear the fan working on all speeds?

it is in the blower assembly, underneath the glove compartment. you can find a cable or a vacuum solenoid that holds a flap that you can control with the recycle switch.

tnx 4 using fixya,

drcool