2.0hdi Lift Up Pump Noise

[Guest Nuno]

Hi all,

my Xantia, when AC is off and I just start the car cold, after sometime, (should be when it gets the temperature) starts to sound, from the lift up pump I think, a trrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

I switch off the car and back on, and noise gone.

If I start the car and AC is always on, then no problem, or if ride the car fast from cold.

 

I changed the lift up pump, because I heard terrible stories, and filters. Same result.

Because this noise resets when I switch off the car i thought, ok this could be a relay getting stuck, so I changed the relay that controls lift up pump.

 

Is there any solenoid valve that controls, for instance the diesel return line?

Any ideas?

 

Thx

Nuno