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  #1  
Old 03-10-2022, 03:28 PM
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Coolant tank 1.2 bar (17.4 lb) cap upgrade

The X5 has been waiting for this upgrade. It's been out of stock for a while. After replacing the thermostat, I checked again. It was in stock. Ordered it Mon and it arrived yesterday. BMW sure uses a high pressure cap on older models. All new models are now a more industry standard close to 16-18 lbs. The new cap should provide time to fix other items before a coolant system overhaul. A new tank is ready to go on. The current tank is a replacement from marking. I won't know until it's replaced. I've read so many stores about plastic parts failures. Texas being a hot summer state, I think it's worth a try. It does have a new fan and clutch. The auxiliary fan is brushless for efficiency. I'll follow up on it when hot weather is here.


https://germanautosolutions.com/stor...r-coolant-cap/
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  #2  
Old 03-10-2022, 04:16 PM
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Models with diesel engines have 1,4 bar expansion cap (17137639023). (On petrol engines 2,0 bar.)
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  #3  
Old 03-11-2022, 01:07 AM
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Quote:
Originally Posted by Clavurion View Post
Models with diesel engines have 1,4 bar expansion cap (17137639023). (On petrol engines 2,0 bar.)
I replaced my 2 bar cap with 1.4 bar cap from E34, M50 engine. Cheap alternative to the G.A.S. cap. I wanted to buy it but shipping to Canada was higher than the cap itself
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  #4  
Old 03-11-2022, 12:56 PM
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interchangeable expansion tank caps? are all the same size?

Quote:
Originally Posted by Bmwe5320023.0 View Post
I replaced my 2 bar cap with 1.4 bar cap from E34, M50 engine. Cheap alternative to the G.A.S. cap. I wanted to buy it but shipping to Canada was higher than the cap itself
Would that cap fit an expansion tank for a 3.0i M54 engine, like on my '01 X5? I like cheaper alternatives, where possible, though the aluminum cap is quite nice.
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  #5  
Old 03-11-2022, 03:14 PM
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Yes it fits. I put one 1.4 cap on X5 M54 engine and another on E39 M52 engine.
I personally never had trouble unscrewing the plastic cap with my hands.
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  #6  
Old 03-10-2022, 05:06 PM
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I've invented a litany of new curse words trying to get the OE cap off over the years. Worst design in the world. Gave up and use a strap wrench every time. Thinking of this upgrade just for a more hand-friendly cap.
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  #7  
Old 03-10-2022, 07:56 PM
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You won't be disappointed. The aluminum top is solid. Easy to grab. Better than carrying channel locks to open the stock plastic one.
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  #8  
Old 03-11-2022, 04:36 PM
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https://www.realoem.com/bmw/enUS/partxref?q=17137639023
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  #9  
Old 03-11-2022, 09:15 PM
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https://www.fcpeuro.com/products/bmw...ap-17111742232

Reutter is the OE mfgr. You used to be able to snag one on Amazon for under $20, but they no longer list them as available. Like everything else in this economy, it looks like the price has increased.

AM.
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  #10  
Old 03-12-2022, 12:53 AM
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For $17 difference... I'll take that sexy one you posted X5chemist. Yeah, I like shiny things... you want to fight about it.
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2006 X5 4.8is Build 11/05 Maintenance/Build Log
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