C5 2.2 Hdi Intercooler Bypass pipe... How does it work ?

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Post Reply
KevMayer
Posts: 1051
Joined: 12 Sep 2003, 22:01
Location: Staffordshire, United Kingdom
My Cars:
x 2

C5 2.2 Hdi Intercooler Bypass pipe... How does it work ?

Post by KevMayer »

Hi.

My C5 2.2 Hdi has a bypass air duct which runs in parallel to the Intercooler.

The bypass duct has a water jacket around it with a top and bottom water pipe inlet/outlet connection from the cooling system.

There doesn't seem to be any shut off flap to open and close the bypass duct. It looks like its always connected. I think its something to do with the regeneration of the particulate filter in the exhaust.

Does anyone know how it works ?
Cheers, Kev

02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).

Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
User avatar
AndersDK
Posts: 6060
Joined: 21 Feb 2003, 04:56
Location: Denmark
My Cars:
x 1

Post by AndersDK »

http://www.citroen-pr.net/catalogues/il ... 20A38A.gif

That would be either item 1 or 2 in your C5 ?
Sorry - no idea - just nosed in with a drawing to help any explanations.
Anders (DK) - '90 BX16Image
wheeler
Posts: 6847
Joined: 21 Sep 2002, 19:07
Location: United Kingdom
My Cars:
x 717

Re: C5 2.2 Hdi Intercooler Bypass pipe... How does it work

Post by wheeler »

KevMayer wrote:Hi.

There doesn't seem to be any shut off flap to open and close the bypass duct. It looks like its always connected. I think its something to do with the regeneration of the particulate filter in the exhaust
Your right it is for particle filter re-generation,there are 2 vaccum operated butterfly flaps to controll which route the air takes.
during re-gen it needs to get hot as possible so it misses out the IC.
wheeler
Posts: 6847
Joined: 21 Sep 2002, 19:07
Location: United Kingdom
My Cars:
x 717

Post by wheeler »

numbers 1 & 2 are the butterfly flaps http://www.citroen-pr.net/catalogues/il ... 20A68A.gif
KevMayer
Posts: 1051
Joined: 12 Sep 2003, 22:01
Location: Staffordshire, United Kingdom
My Cars:
x 2

Post by KevMayer »

Excellent replies.

I've had another look and can see the butterfly valves.

Thanks Anders and Wheeler.

Cheers, Kev
Cheers, Kev

02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).

Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
Post Reply