Thin Black Hoses/pipes?

[chunkymunky1988]

Hi all, I've got a new coolant temperature sensor to fit to my 2.2hdi and whilst looking at what I have to take off I noticed on the side of the airbox there is some sort of sensor with two tiny black hoses coming out of it. One of these hoses goes to the top of the engine into a plastic t piece and has a little split on a rubber covering by the t piece. Any idea what these hoses are for and what that sensor does? Cheers

[paul.h]

Looking at a photo from our 2004 2.2 hdi (yours is 2001) there is a cylindrical sensor on the cylinder head side of the filter box with an orange electrical connector and 2 black hoses - 1 looks to go to the vacuum pump (where you have the split) and the other to the actuator on the air doser valve which directs the air from the turbo through the intercooler. You need to sort out the split in the hose since it can give all sorts of running problems if it leaks and reduces the vacuum to the sensors, such as a fault code for an egr valve.

 

The parts diagrams call it an electro valve part no. 1628LQ and the RTA manual covering the 2.2 hdi it calls the sensor 'electrovannes de commande des doseurs d'air chaud et d'air froid'. So it look as if it controls the doser valve to cool the air from the turbo.