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Old 12-07-2016, 08:22 AM   #1
bbill1
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Annoying drip at tstat/upper coolant hose.

I have already replaced the upper coolant hose to try and stop this. Also tried replacing the o-ring as well. It's just a small drip that basically equates to a cup of coolant a week but it bugs the $hit out of me. I have noticed that the fit is just slightly sloppy at the connection. Both the thermostat housing and the hose are BMW and not knockoffs. Does anyone else have this issue? You can't really see it unless you use a small mirror to view the underside of the connection.
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Old 12-07-2016, 08:40 AM   #2
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Sounds like the upper rad hose may have a bad o-ring. Take off the hose and inspect it; it should have a round profile and not be nicked or torn anywhere.
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Old 12-07-2016, 08:52 AM   #3
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Add a small ring of hi-temp red silicone around/on the o-ring and it will stop the leak. I did that on all my intersections and have a completely dry engine compartment.
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Old 12-07-2016, 09:25 AM   #4
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Quote:
Originally Posted by bbill1 View Post
I have already replaced the upper coolant hose to try and stop this. Also tried replacing the o-ring as well. It's just a small drip that basically equates to a cup of coolant a week but it bugs the $hit out of me. I have noticed that the fit is just slightly sloppy at the connection. Both the thermostat housing and the hose are BMW and not knockoffs. Does anyone else have this issue? You can't really see it unless you use a small mirror to view the underside of the connection.
I wasn't aware the Genuine BMW hoses had replaceable o-rings.

I'm guessing the original hose had a bad o-ring, and the replacement o-ring you put in was not the correct size or material, or it was kinked or damaged when installed.
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Old 12-07-2016, 09:43 AM   #5
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Could it be the infamous tstat housing leak as seen on some wahlers and behrs? The oring inside the housing on the electrical component needs replacing

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Old 12-07-2016, 09:46 AM   #6
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http://forum.e46fanatics.com/showthread.php?t=1024538


http://forum.e46fanatics.com/showthread.php?t=975417
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Old 12-07-2016, 09:51 AM   #7
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And a video just in case.
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Old 12-07-2016, 11:37 AM   #8
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It's leaking from the Hose to Tstat housing joint. I tried replacing the oring (38x4mm Buna 70) but it still leaked so I purchased a new upper hose. Same thing. It is not leaking from the sensor. I have a new behr thermostat housing and gasket coming. We'll see if that takes care of it.
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Old 12-07-2016, 03:01 PM   #9
bbill1
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Fixed. Installed the new behr thermostat housing and gasket. No more leak.
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