RobertA6

I need a good type power Steering fluid for my A6 2002. my car keeps making noise like there is no power steering fluid and when I check it, the fluid become fuzz. Please help

K04-S4

Go to Audi Dealer and ask for OEM G4000. PS System holds just under 1L.

The foam you are seeing is because there is air getting in the system. If too much air is in the system, fluid level will appear normal when the engine is off but will be too low when engine is running causing fluid airation. A cavitating air bubble in the center of the centrifugal pump can damage expensive parts if left too long. Try a PS Fluid flush and check PS hoses and clamps for leaks.

rusty_67

iTrader: (1)

May also want to check that there is no fluid in the boots. Is PS fluid level low? have you had to add any in the past?

RobertA6

Thank you for your reply all, I did change my PS fluid recently but it started when I open the PS pipe to be able to change the Thermostat then the thing start to make the noise. I did add LOCAS PS fluid and the noise gone for almost 10 days then it's back again so often. I will check for leak again but I don't see any missing or low PS fluid. Is it only G4000 work with Audi or I can use something different?

Thanks again

K04-S4

Different folks will give you different opinions on Power Steering Fluid so it is really up to you. Personally I would not use anything other than 1L OEM G4000 PS Fluid or Pentosin Power Steering Fluid CHF 11S.

Regarding the noise, sounds like cavitation from an air bubble trapped in the center of your PS Pump. Audi says a properly operating PS System will self bleed in approx 1000 KMs. You could try Park and rev ~4K for 30 secs to no more than 1 minute to see if that clears the majority of the cavitating air bubble. This will not help if air is getting into the system as noise will return and your fluid level will go up so suggest monitor fluid level regularly until resolved.

RobertA6

You Know what Guys, I went to the dealer andgot my A6 1L of the G4000 and wasn,t bad at all price wise ands since I had it in the car nothing came up no fuzz no noice. I think that is the one. Thanks a lot for all of your information. But one thing I have learned from this deal. Any junk other than the original stuff will make it worse especially the cheap material.

rusty_67

iTrader: (1)

yah I think its a good idea to stick with what they ask for..

Hydraulic systems can be touchy when it comes to viscosity. A viscosity too high can result in pressure drops and sluggish responses and can ultimatley lead to pump cavitation. A viscosity too low results in unnecessary wear and ultimately leakage.

Now we all know that different fluids have different viscosities (at a nominal temerature), but they also have a property that differs called the viscosity index. The viscosity index refers to the amount the viscosity changes with temperature. This is a very important figure especially here in canada where temperatures can vary so much throughout the year.

I'm babbling now, but you get the point

class dismissed

jakemandue

how do i flush my power steering fluid... my car feels like it only has half the power steering power. and it makes a loud noise in the winter. it has no leaks, nor have i ever had to put fluid in it

K04-S4

The loud noise is likely cavitation because air is getting into the hydraulic system somewhere. Check all hoses and clamps for any PS Fluid wetness. Even with no visible leak or fluid loss, you can still have a loose clamp / loose hose connection that lets air in and traps in the center of the pump.

I've used two methods depending on what the issue is.

If you want all possible old fluid replaced and esp if you have serviced the PS Hydraulic System, remove plastic Sound Dampener under engine bay and you should find two PS hoses going to and from the PS cooler. Disconnect the hose attached to the lower portion of the cooler / let drain / turn steering wheel lock to lock several times until no more fluid comes out / seal as best you can and blow compressed air into the reservoir / clean reservoir interior / reconnect lower cooler hose / fill reservoir to the top / run engine at idle for 2 seconds ideally with someone watching reservoir to ensure it does not get too low and suck in ANY air / engine off & fill reservoir again / run engine at idle & turn wheels lock to lock ten times / watch and set final fluid level. This approach does introduce air into the system so don't be suprised if a few air bubbles come out. The most important step is to not allow ANY air to get sucked into the pump during the re-fill process or you will likely have cavitation for awhile.

Another method typically used just to replace fluid is to use a fluid extractor and empty the reservoir / fill reservoir / run engine at idle and turn wheels lock to lock several times then engine off / use extractor to empty reservoir again then re-fill / run engine at idle and turn wheels lock to lock several times. You can repeat a third time to use a full 1L bottle of new fluid. This is a quick way to get "most" of the old fluid out and not risk sucking in air during the refill.

hunibuni

I live in Alberta- so we have major fluctuation in temperatures, but I have no "fuzz" in my ps tank, but it makes so much noise when I start the car and even when it warms up, it still noisy when I turn the wheels, would flushing the fluid help with this, or is it just cold outside or could it be the pump itself? any advice would be greatly appreciated.
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