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Pas pump noise when cold


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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!

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"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.

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