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#1
12-11-2023, 10:56 PM
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Coolant Leak at Radiator
I'm thinking it's leaking from the radiator mounting plate. Does coolant actually flow through this piece? And how does it seal? I didn't see where I could buy replacement seals for it. It's PN 17111438819.
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2000 e39 M5 Titanium on Black 2006 e53 M54 Titanium on Black 2007 e83 Black on Black Sport pkg 2004 Avalanche 2500 lifted 4.88 gears 1994 jacked up Jeep 1987 GMC lifted short bed on tons 
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#3
12-11-2023, 11:47 PM
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I can't get a pic of the radiator without taking everything apart unfortunately.
Is there a drop-in radiator upgrade I can buy for the M54 engine and auto trans? Like the 4.6 or 4.8 radiator?
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2000 e39 M5 Titanium on Black 2006 e53 M54 Titanium on Black 2007 e83 Black on Black Sport pkg 2004 Avalanche 2500 lifted 4.88 gears 1994 jacked up Jeep 1987 GMC lifted short bed on tons
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#6
12-12-2023, 01:04 AM
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You could have a cracked tank,like I did...
I just bought a new tank and rebuilt the radiator after it was rodded out. The crack in mine was on the left side tank about 3" above the outlet tube and it only leaked after shutdown (until it blew out) Sent from my SM-A528B using Tapatalk
__________________
"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course
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#7
12-12-2023, 07:49 AM
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I know I'm probably looking at a cooling overhaul. I already did the thermostat,water pump, hoses, and expansion tank maybe 30k miles ago. So probably will do the other parts now. I'm just curious if this mounting plate can leak or if it seals to the radiator somehow? I guess it must I just don't see how without taking it apart.
Are there any drop in radiator upgrades? As example the Z3 S54 radiator was a bigger direct fit for the e36 M3.
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2000 e39 M5 Titanium on Black 2006 e53 M54 Titanium on Black 2007 e83 Black on Black Sport pkg 2004 Avalanche 2500 lifted 4.88 gears 1994 jacked up Jeep 1987 GMC lifted short bed on tons
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#8
12-12-2023, 07:51 AM
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Stock radiator pic
__________________
2000 e39 M5 Titanium on Black 2006 e53 M54 Titanium on Black 2007 e83 Black on Black Sport pkg 2004 Avalanche 2500 lifted 4.88 gears 1994 jacked up Jeep 1987 GMC lifted short bed on tons
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#9
12-12-2023, 09:28 AM
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The mounting plate is like it's own tank. Water flow through it is for transmission oil cooling. If you replace it, order a transmission oil thermostat! It will break if you try to remove it. Mine did. The plate is connected to the radiator with another three way flow adapter.
__________________
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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#10
12-13-2023, 07:02 PM
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Interesting. I would have said that the mounting plate doesn’t have coolant in it because my N62 doesn’t. It’s also a stupid design for yet another failure point. But on looking at the part, it certainly does look like it has coolant flowing through.
Note: our radiators are aluminum with plastic end caps, like most cars these days. The failure point is on the seam where the plastic connects to the metal. Mine has had a pinhole leak for the last couple of years and I’ve been putting liquid epoxy on the seam as a temp fix. Seems to work ok. I’ll change the radiator in the summer. My N62 setup: https://www.realoem.com/bmw/enUS/sho...diagId=17_0291
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2005 X5 4.4i SterlingGrau, Sport Package, DSP Build 3/12/2005
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