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  #11  
Old 08-16-2018, 12:05 AM
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Quote:
Originally Posted by fishhouse4 View Post
I'll toss the old cap on and watch it for a few days and see what happens.




Attempted to bleed the system again today. Removed cap and loosened bleeder screw. Ran with heat all the way on high. It burped once or twice every 10-20 seconds. Let it run for 6 minutes.

Here's a video (after about 4 min of running) - note the burps around 10 and 30 seconds in.

Is that what it should be doing? Should I let it run longer (it never stopped doing this bubble every 10+ seconds)?
You need to open the bleeder further. That said, after six minutes if it's only burping like that it should be pretty much done. As someone else said, the hose collapsing is not normal. Checked mine this morning and it looks the same as when hot. Pull the cap when you park it and see how it looks in the morning. I suspect it won't be collapsed and that means it's your cap not venting in and out properly.
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  #12  
Old 08-16-2018, 04:23 PM
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Don't forget to turn your heat to hot, you need to circulate coolant in the heating circuit as you bleed the system.
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  #13  
Old 08-18-2018, 04:27 AM
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Quote:
Originally Posted by audiophool View Post
Not normal. Your radiator cap has a vacuum valve in it which is designed to allow the system to return to atmospheric pressure after cooldown from a running engine. Try another cap.


Your cap isn't venting air back in during cool down cycle...

Good luck!!

Cheers!!
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  #14  
Old 08-18-2018, 11:56 AM
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Originally Posted by audiophool View Post
Not normal. Your radiator cap has a vacuum valve in it which is designed to allow the system to return to atmospheric pressure after cooldown from a running engine. Try another cap.
Not true, the vacuum vent valve is designed to hold a slight vacuum so the system will actually only be at atmospheric for a short time during cool down, not after, unless you open the cap.
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  #15  
Old 08-18-2018, 01:51 PM
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Quote:
Originally Posted by 80stech View Post
Not true, the vacuum vent valve is designed to hold a slight vacuum so the system will actually only be at atmospheric for a short time during cool down, not after, unless you open the cap.

Slight is the key word. If it's enough for the upper radiator hose to collapse, the cap is faulty. If normal, everybody's car would be doing it.
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  #16  
Old 08-18-2018, 08:44 PM
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It does happen to many vehicles. Mine does it since I replaced the upper rad hose with a Rein and have tried three different/new radiator caps. I have seen the problem in many different vehicles and even stocked a rad cap that didn't have a vent valve spring for that reason. The problem then becomes the vent valve possibly not closing and there are advantages to having the slight vacuum after cool down.
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  #17  
Old 08-19-2018, 09:33 AM
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Just to report back in on this one: It's been 4 days since I bleed the system again. I have checked it a couple of times each day since when it is cool (even after a 3 hour drive yesterday).

I have not yet seen the hose collapse again! Previously it was doing it after every cool down. So I have to guess that I just didn't bleed it enough the first time several weeks back and that doing it again somehow helped/fixed the issue.

I'll continue to monitor and will replace the expansion tank cap with a spare that I have as a step 2 measure, if it starts to act up again.

Thanks as usual to everyone for all the advice!!!
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  #18  
Old 08-19-2018, 11:00 AM
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Excellent! It still would be nice to verify from someone if the BMW OE replacement hoses are indeed stiffer than some of the aftermarket ones.
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  #19  
Old 08-19-2018, 11:15 AM
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Quote:
Originally Posted by 80stech View Post
Excellent! It still would be nice to verify from someone if the BMW OE replacement hoses are indeed stiffer than some of the aftermarket ones.

Indeed. Mine is pretty squishy - wouldn't describe it as very stiff at all. Not sure how that compares to others. Guessing they get softer with age?
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