minimaquinas Posted April 9, 2016 Share Posted April 9, 2016 Hi my 300tdi pas pump moans for the first few minutes after starting from cold but is ok all day after that any ideas what to look at Quote Link to comment Share on other sites More sharing options...
deep Posted April 10, 2016 Share Posted April 10, 2016 Just a guess but I'd think it's the pressure release valve working. Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 10, 2016 Share Posted April 10, 2016 Try draining it down and replacing the fluid - it does break down and get contaminated, and needs changes just like the other fluids. Quote Link to comment Share on other sites More sharing options...
monkie Posted April 10, 2016 Share Posted April 10, 2016 Try the above first, but don't ignore it if that doesn't help. This happened to me a couple of years ago and I ignored it for a while. I think I had noticed a lot of air in the fluid (can't quite remember). When I drove off the drive one day (luckily backwards and in the daylight) I saw a trail of PAS fluid. I stopped and took a look under the bonnet to find the pulley for the PAS pump hanging out of the pump with fluid everywhere. I think it was down to a failed bearing, but was hard to tell as I was looking at a load of broken metal! I don't know if you would be able to feel roughness in the bearings if you took off the serpentine belt and felt the PAS pump pulley by hand for anything unusual - might be worth a try, I didn't think to look! Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 10, 2016 Share Posted April 10, 2016 "I don't know if you would be able to feel roughness in the bearings if you took off the serpentine belt and felt the PAS pump pulley by hand for anything unusual - might be worth a try, I didn't think to look!" Yes, you should. The pump should turn easily and smooth;y by hand with just a little resistance from the seal. Any play, roughness or stiffness is indicative of a failed pump. Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted April 10, 2016 Author Share Posted April 10, 2016 Thanks guys I have never changed the fluid in 5 years except when I replaced the flexi hose to the steering box it only makes the noise for about half mile then goes away but only started doing it a few weeks ago Quote Link to comment Share on other sites More sharing options...
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