2003 BMW X5 4.4i Cooling System Overhaul - Bimmerfest - BMW Forums

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Old 07-23-2012, 01:10 PM
Nathan_J Nathan_J is offline
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Location: Toronto
Join Date: Jul 2012
Posts: 4
Mein Auto: 03 BMW X5 4.4i
Exclamation 2003 BMW X5 4.4i Cooling System Overhaul

I have a few questions for my cooling system overhaul,

2003 BMW X5 4.4i 237K km's

Recently my serpentine belt tore and I went to replace it (DIY) and discovered when I tried to tighten the tensioner pulley the water pump pulley tilted down a little due to the tension. I discovered this after when I turned my car back on and noticed the serpentine belt was slowly coming off the water pump pulley as it spun. After releasing the tensioner pulley I was able to slightly move the water pump pulley with my hands(still attached to the fan clutch) and would "pop" down or up depending on which direction I was pulling or pushing. From the forums I discovered if you can move or "play" the water pump/water pump pulley it meant that it's time for replacing.

My question here is, do I need to replace my fan clutch as well? What are the signs when one needs to replace the fan clutch?

Also, my coolant reservoir is leaking profusely, from the top lid coming out of the seams, everywhere. I am ordering a new cap and tank to replace the old one, my question is, do I need to replace the coolant sensor or can I use my existing one? My sensor seemed to work fine as it constantly reminded me to "check coolant level" since my reservoir was leaking, so I'm guessing it's doing it's job.

So to reiterate,

1. How do I know if I need to replace my fan clutch and do I need to replace it based on my description?
2. Can I reuse my coolant sensor when replacing the coolant reservoir?

Thanks in advance!
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