I am having some problems with the power steering of my Passat 2.8 V6 BBG 120000KM. I have done some research and read many posts but I am still confused.
Few days ago I noticed that the power steering is behaving really weird, it was very light when turning at high speed (very dangerous) and then before reaching home it started making some noise, when I accelerate the noise is louder, the same thing happen if I turn the steering left or right. when I stopped the car and checked the reservoir the liquid was foaming.
From the research I have done I understood that there is some air in the circuit. I have performed the VW procedure to remove the air, the power steering is not behaving weird but still really noisy.
I checked the hoses for leaks, I found a very small amount of oil on the input of the pump (hose coming from reservoir) and on return from the rack (just at the connection between the solid hose and soft one, it is visible from the hole of the front left wheel).
I cleaned all hoses and checked again for leaks, I didn't find a single drop.
My oil level is not going down, it was even high. I had to remove some of it.
Note that I bought the car recently so not sure which type of oil is inside.
I have few question if you can help me please:
How to check for leaks inside the rack?
I know that the leak will be obvious on the pressure side (from pump to rack) but how do you check for a leak on the return hose especially on the intake hose since it's sucking oil which mean it can suck air without leaking oil? I may be completely wrong in my thinking.
Can the pump be damaged and allow air in the circuit?
The liquid is not foaming like before but I can see some bubbles in the container, not sure if it's normal. How I can be sure that air is still getting in the circuit?
The reference of my pump is 8d0 145 156 F but Ecs tuning are showing another one with FX at the end. Are they the same? I found another one with FXKT at the end.
From my description, do you suggest me to go for a new pump and new oil?
Thank you in advance.