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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Dec-06-2012, 01:00:22 AM   #11
///NNM
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Default Re: Coolant Temp Sensor Leak DIY Fix

the coolant o-rings are different than just rubber household ones. not saying it will not work, but you might have to readdress this later.
ECS tuning selling green O-ring. Autostores probably too.
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Old Thu, Dec-06-2012, 01:15:25 AM   #12
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Default Re: Coolant Temp Sensor Leak DIY Fix

Quote:
Originally Posted by kkamakasi View Post
Looks like I'm having the same problem here.

How do I minimize the amount of coolant loss from when I unplug the temp sensor? Anything around the house that will temporarily fit into that hole to plug it up so I won't lose as much coolant when I need both of my hands to replace that o-ring?
just to answer this question:
you will NOT loose a lot of coolant when you unplug this sensor. Cooling system is a sealed system. unless you open the bleed screw or unhook cables or open the expansion tank cap, you aren't going to lose much coolant.
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Old Thu, Dec-06-2012, 03:17:48 AM   #13
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Default Re: Coolant Temp Sensor Leak DIY Fix

Here's what you need, from this thread:

Quote:
Originally Posted by p0lar
I replaced my coolant temperature sensor O-Ring with the BMW part number listed above, and there is no leak. We compared the a new o-ring taken from a temperature sensor with the single O-ring supplied above and could not discern any notable differences, though we didn't have calipers on us.

I mic'd the one at home (used, taken from my sensor) and the new one and the OD was slightly smaller on the used one (as expected) but the ID was spot on. The thickness came in right at 3.0 mm.

...

This is one of those inexpensive things, much like the CPV O-Ring, that I would have no problem making the suggestion to add to a certain maintenance interval - say 60k miles (or better yet, when the coolant is changed!)? I replaced mine without losing a single drop of coolant, while the system was full. I'll give it a few days and then check the bleeder valve for any additional air that may have been captured upon insertion of the sensor.
Specifically this post.

Part number: 13.62.1.743.299

It's a dead ringer, as in - EXACT MATERIAL MATCH - for the O-Ring on the coolant temp sensor, even down to the colour. I replaced it and haven't lost a drop of coolant since. The best part? It cost $1 from the stealership.
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Discussing Coolant Temp Sensor Leak DIY Fix in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)