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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Aluminum Hose Bib Replacement for T-Stat Hose



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      05-26-2019, 08:21 AM   #1
Efthreeoh
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Aluminum Hose Bib Replacement for T-Stat Hose

I've not seen anyone post a DIY for replacing the plastic hose bib on the Thermostat-to-Head coolant hose for the N52 and N54. The same hose bib is used for either engine.

This is a DIY for removal and replacement of the E9X N52 Thermostat-to-Head coolant hose aluminum hose bib. Cutting the band clamp securing the hose bib risks compromising the hose. Breaking up the old, week plastic hose bib is a better in-car solution using the right tools and does not require complete removal of the hose from the engine. I used a large Channel Lock plyers (it is a Stanley tool actually) and I used a Craftsman water hose clamp plyers. This DIY is based on using similar tools. The procedure breaks up the old hose bib inside the hose end and has risk of leaving old pieces of plastic in the cooling system, which could jam the water pump, so you must be very careful to ensure no small broken plastic falls down the hose.

Please see attached .pdf file for detailed instructions.
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File Type: pdf E90 Waterhose Bib replacement_pics.pdf (618.4 KB, 43 views)
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Last edited by Efthreeoh; 05-26-2019 at 09:21 AM..
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      05-26-2019, 03:41 PM   #2
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I'm actually doing this today.

For your other coolant hose DIY, what is the best thing to use as a lubricant for the O-rings in the snap-lock fittings? The Bentley manual doesn't seem to have anything on that and I've read some people use coolant.
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      05-26-2019, 05:27 PM   #3
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Quote:
Originally Posted by CTinline-six View Post
I'm actually doing this today.

For your other coolant hose DIY, what is the best thing to use as a lubricant for the O-rings in the snap-lock fittings? The Bentley manual doesn't seem to have anything on that and I've read some people use coolant.
I used spit...

BMW says not to use anything on the O-rings.

I hope the hose bib DIY works for you.
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      05-27-2019, 11:45 AM   #4
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I had to do this repair on my car last year in the parking lot at work when that plastic hose end sheared completely off. I used a small pair of needle nose vice-grips with the jaws wrapped in duct tape to clamp the hose shut below the broken plastic end piece.

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      05-27-2019, 11:47 AM   #5
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Quote:
Originally Posted by CTinline-six View Post
I'm actually doing this today.

For your other coolant hose DIY, what is the best thing to use as a lubricant for the O-rings in the snap-lock fittings? The Bentley manual doesn't seem to have anything on that and I've read some people use coolant.
Undiluted anti-freeze / coolant (the concentrate that you mix 50-50 with water) works good as an o-ring lubricant on cooling system o-rings.
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      05-28-2019, 05:28 AM   #6
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Per the BMW TIS regarding coolant hose O-rings
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      05-28-2019, 05:35 AM   #7
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Quote:
Originally Posted by arkie6 View Post
I had to do this repair on my car last year in the parking lot at work when that plastic hose end sheared completely off. I used a small pair of needle nose vice-grips with the jaws wrapped in duct tape to clamp the hose shut below the broken plastic end piece.

I used this exact tool to pinch the t-stat hose:
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission.
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      05-28-2019, 05:49 AM   #8
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Useful guide OP. Is there anything externally to suggest imminent failure of the OEM bib? Mine's done over 100K yet from the outside it looks in perfect condition. Mind you I do regularly clean the hoses and joints and also do regular changes of coolant...
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      05-28-2019, 06:57 AM   #9
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Quote:
Originally Posted by Phil325i View Post
Useful guide OP. Is there anything externally to suggest imminent failure of the OEM bib? Mine's done over 100K yet from the outside it looks in perfect condition. Mind you I do regularly clean the hoses and joints and also do regular changes of coolant...
Those plastic hose ends degrade from the inside out. Mine looked fine on the outside. Mine is a 2008 335i with around 100,000 miles at the time of failure.
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      05-28-2019, 09:04 AM   #10
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Quote:
Originally Posted by arkie6 View Post
Those plastic hose ends degrade from the inside out. Mine looked fine on the outside. Mine is a 2008 335i with around 100,000 miles at the time of failure.
Thanks. So what are the symptoms of failure? Coolant leak? Pieces of plastic in the coolant header?
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      05-28-2019, 09:18 AM   #11
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Quote:
Originally Posted by Efthreeoh View Post
I used spit...

BMW says not to use anything on the O-rings.

I hope the hose bib DIY works for you.
It worked great. I did this on my 2006 a few years ago, and now with this car I just looked through it to find the torque specs. It also helped refresh my mind on using the bolts to draw the bib in so it wouldn't strip the threads.

I ended up using straight BMW coolant on the o-ring for the upper radiator hose (I also did my OFHG this weekend) and just cleaned everything else really well with no lubricant. Seems to be doing well so far, and no leaks after doing the coolant bleed procedure. I plan on checking for leaks again tonight.
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      05-28-2019, 09:37 AM   #12
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Quote:
Originally Posted by Phil325i View Post
Useful guide OP. Is there anything externally to suggest imminent failure of the OEM bib? Mine's done over 100K yet from the outside it looks in perfect condition. Mind you I do regularly clean the hoses and joints and also do regular changes of coolant...
I replaced all my cooling system hoses at 8 years and 231,000 miles. I didn't inspect the t-stat hose bib at that time because failure of them had not become an issue back then, or at least for the N52. So, the current T-stat hose has been in for a little over 4 years and 144,000. I'd say the plastic was "soft", but still pretty sound. I don't think it was close to failure, but it didn't take much to break it apart.

I also have a Z4 with the N52. The T-stat hose is original, 11 years old with 95,000 miles on it. I plan on swapping the hose bib out in the next few weeks. I'll report back on the condition of that piece.
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      05-28-2019, 02:18 PM   #13
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Quote:
Originally Posted by Phil325i View Post
Thanks. So what are the symptoms of failure? Coolant leak? Pieces of plastic in the coolant header?
The hose end broke clean off and most of the coolant dumped out. Low coolant level was the first indication something was wrong. I was at work in the parking lot and had just started the engine in the afternoon getting ready to go home. I tried adding some water so that I could get home, but I soon realized it was running out as fast as i was pouring it in. Then I saw the hose just laying there with one end not connected to anything.
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      05-28-2019, 08:47 PM   #14
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Here is a pic of mine on the car.
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      05-29-2019, 12:16 PM   #15
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Well I guess I have to spend more money now huh? Thanks. Ha

I've been meaning to swap this out for quite sometime and now seeing your post I'll go place an order and place it with extensive repairs that's already being done on the car.

good stuff
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