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Old 07-31-2010, 10:42 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
In the entire E39 search, I couldn't find a specification for just the green O-ring that everyone says fails ... but searching outside the E39 cars, I do find the E46 guys have been active in finding replacements for the $1 O-ring (either made of Viton or Buna N material).

I opened an E39 thread specifically asking someone to MEASURE their new coolant temperature sensor O-ring ... and I'll add the part number I found to the post above for recommended parts for a cooling system overhaul.

I think the O-ring part number is:

- Coolant Temp Sensor O-Ring is a BMW Part Number
- DIY - Temp. sensor coolant leak repair
- E46 Cooling system temperature sensor part number
- Replacing the coolant temperature sensor DIY
- Recommended parts list for a cooling system overhaul
- E46 lower radiator hose coolant temperature sensor
- BrassCraft 0567 replacement for coolant temperature sensor o ring
- BrassCraft and Viton replacements for coolant temperature sensor o-ring
- Coolant temperature sensor o-ring dimensions
- Replace coolant temperature sensor o-ring with viton from macro rubber

Last edited by bluebee; 07-31-2010 at 10:57 PM.
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