Having problems with your 1991 Peugeot 405 ?

Knocking noise from air evap unit

\015 Car developed a knocking noise under the dash.. on further investigation it goes away when you turn on the recycled air button but returns as soon as you go back to fresh... took the glove box out and the noise is coming from the big cylinder thing whish i beleive is the air dryer?? any advice apreciated as to how to get this unit out..\015 Posted / edited by AnonymousUser on : 14-01-2019

Answers :

2 fixes - read on - one quick and one long and hard
\015\012(little tip - take pics (camera phone) rather than try and remember how it should all go back together)
\015\012the knocking is a motor and gears that move the fresh air/recycle flap - it is up behind the dashboard behind the glovebox
\015\012the problem is that the gears wear and become misaligned
\015\012the flap then can not open fully, its doesnt reach its end stop which switches the motor off
\015\012so the motor keeps going the and the gears keep clicking over
\015\012the big cylindrical thing you are seeing is the blower motor - it should have a red and a black wire going to it
\015\0121. quick fix first
\015\012remove the wires to the blower motor
\015\012undo the 3 brass coloured cross head screw from around the blower motor
\015\012remove the blow motor and fan
\015\012turn on the ignition and put the air flow to fresh air (i.e not recycle)
\015\012the knocking should start
\015\012lay on your back with your head i the footwell
\015\012with torch and hands locate the motor/gears that are knocking
\015\012find the wires to the motor and remove or cut them (if cutting turn the ignition off first !!!)
\015\012make sure the flap is in the open position, tape,jam or wire it open (who uses the recycle position anyway ??)
\015\0122. long hard fix
\015\012remove the blower motor as described above
\015\012this leaves the fan casing
\015\012from the engine bay remove the plastic cover from the top where the windsceen wiper motor is (just below the windscreen)
\015\012depending on model you may have the engine management CPU on the right handside - this may need removing
\015\012on the right hand side there will be 3 (maybe 4) bolts just above where the fan housing is
\015\012undo 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 ???
\015\012if 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.
\015\012once all this is out - locate the motor/gear making the noise (as above)
\015\012remove 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
\015\012now 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
\015\012shouldnt take more than a day or two, or a finger or two
Repair Help & Product Troubleshooting for 1991 Peugeot 405

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