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#11
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#12
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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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2002 Euro X5 (E53) 3.0 diesel (M57) 5 speed manual with UUC short shifter. Pre-xDrive NV125 transfer case (chain & gears). Factory Xenon headlights, Spyder LED tail lights Updated vortex crankcase breather. Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC Bilstein B6 shocks F&R Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S). Dimple magnetic drain plugs in all compartments. |
#13
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Your cap isn't venting air back in during cool down cycle... Good luck!! Cheers!!
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2001 E53 X5 4.4i (03-07-2001 build date) White exterior / hellbeige interior (6MT swap vehicle - Manny) 2002 E53 X5 4.6is (12-20-2001 build date) Imola Red exterior / M-texture interior (Red) 2003 E53 X5 4.4i (06-26-2003 build date) Silver exterior / Black interior (Silvester II) 2008 Mini Cooper S ragtop (04-17-2008 build date) Dark Silver exterior / Gray interior ( Topless) BMWCCA member (#4745) |
#14
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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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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#15
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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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'04 X5 3.0 5AT with 300,000+km - Black '08 535xi 6AT with 290,000+km - Titanium Silver |
#16
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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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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#17
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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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Current garage: 2006 X5 4.8is 2007 Lexus GS350 2011 Cadillac CTS-V Coupe |
#18
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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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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#19
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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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Current garage: 2006 X5 4.8is 2007 Lexus GS350 2011 Cadillac CTS-V Coupe |
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