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#1
03-20-2019, 01:12 AM
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2005 bmw x5 4.4 Expansion Tank keeps braking
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#2
03-20-2019, 07:46 AM
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The most common reasons for ET failure are over-filling, age, cheap aftermarket tanks.
Buy an OE tank - either a genuine BMW or an OE Modine (FCP Euro used to sell them). Only fill it so the top of the float stick is even with the top of the tank after properly bleeding the system. You may want to consider buying a 1.4 bar (or 1.2) cap to lower the release pressure. AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather E53 2004 3.0 M54 AT Toledo Blue with Gray Leather E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)
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#3
03-20-2019, 08:26 AM
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Most likely overfill and cheap expansion tank. But I am an avid believer that the 2 bar cap doesn’t help these cars survive the pressure at which your excess water should release if you overfill. You can get an e30 cap from BMW and it’s 1.4 bars.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5
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#4
03-20-2019, 09:16 AM
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Yeah it's a cheap aftermarket one, it was hard to tell but I think the cap it has right now is a 200. Can you send me a link where I could but a new expansion tank?
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#5
03-20-2019, 02:56 PM
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Way to easy
www.ecstuning.com Expansion Tank BMW Includes vent screw and leveling switch Brand: Genuine BMW - Corporate Logo ES#: 38482 Mfg#: 17137501959 LInk: https://www.ecstuning.com/b-genuine-...k/17137501959/ Or Expansion Tank Includes vent screw and leveling switch Brand: Mahle-Behr - Corporate Logo ES#: 3023890 Mfg#: 17137501959 https://www.ecstuning.com/b-mahle_be...137501959~hla/ Stay away no - RUN from the cheap aftermarket parts. They will fail. See all the postings on Expansion tank failures from those who went before you..... Now, regarding the leaks that you are seeing else where. The entire cooling system at 140K is on borrowed time. They have run their normal life cycle and needs a complete replacement. Either all at once or part at a time. Your car, your choice. As each part will fail one at a time in normal driving cycles, start, stop, city, Hwy. Gather up your parts and do the job once and while your in there consider all the passageways and lines.... Just a thought and suggestion. TIP: When you install the hoses, wipe a THIN coating of American Grease Stick SG-4 Sil-Glyde Lube Compound (4 oz Tube) https://www.amazon.com/American-Grea...SIN=B000KXJLXY on the inside hose seals. This will stop them from rolling and binding on install. Plus it keeps them flexible into the future. Works on all rubber seals like the air intake parts around the MAF sensor tube, etc.
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 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 03-20-2019 at 03:25 PM. Reason: Warning
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