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      06-11-2017, 11:53 AM   #1
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Driving today 35-40mph and the low coolant warning comes on and I pull over right away. See coolant pissing out driver side front and leaking passenger side front as well. Splashes of it on the front of the MPower plastic cowl. Big reservoir empty and the back smaller one still full

Any idea what broke? Called BMW roadside to get a tow. You
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      06-11-2017, 12:13 PM   #2
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Need a new radiator. My buddy had the same thing happen. Replaced it problem solved.
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      06-11-2017, 12:14 PM   #3
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Originally Posted by carbon//m3 View Post
Need a new radiator. My buddy had the same thing happen. Replaced it problem solved.
Any idea what caused it? I assume It was covered under warranty??
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      06-11-2017, 12:18 PM   #4
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Any idea what caused it? I assume It was covered under warranty??
Did you hit anything that went under your car? A rock flying on the freeway acting like a bullet would puncture your radiator as well.
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      06-11-2017, 12:20 PM   #5
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Any idea what caused it? I assume It was covered under warranty??
Did you hit anything that went under your car? A rock flying on the freeway acting like a bullet would puncture your radiator as well.
Not that I know of. Was driving in the city going 35-40 and no damage that I can see. Ran my hand across it and it's dry.

Also not leaking from the middle. Leaking from both sides of the car (more so from the driver) which is odd. Looks to be coming down from above but who knows.
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      06-11-2017, 12:34 PM   #6
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Originally Posted by f80er View Post
Not that I know of. Was driving in the city going 35-40 and no damage that I can see. Ran my hand across it and it's dry.

Also not leaking from the middle. Leaking from both sides of the car (more so from the driver) which is odd. Looks to be coming down from above but who knows.
That sounds like a split hose.
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      06-11-2017, 12:51 PM   #7
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Quote:
Originally Posted by f80er View Post
Not that I know of. Was driving in the city going 35-40 and no damage that I can see. Ran my hand across it and it's dry.

Also not leaking from the middle. Leaking from both sides of the car (more so from the driver) which is odd. Looks to be coming down from above but who knows.
That sounds like a split hose.
Yeah that's what I was thinking. Too bad the engine bay is stuffed to the gills so I can't see shit.
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      06-11-2017, 12:58 PM   #8
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Yeah that's what I was thinking. Too bad the engine bay is stuffed to the gills so I can't see shit.
Have it towed to the dealer and let them fix it.
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      06-11-2017, 12:58 PM   #9
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Yeah that's what I was thinking. Too bad the engine bay is stuffed to the gills so I can't see shit.
Have it towed to the dealer and let them fix it.
Already on its way. BMW roadside was great, waited 30 minutes for the truck.
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      06-11-2017, 01:00 PM   #10
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Already on its way. BMW roadside was great, waited 30 minutes for the truck.
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      06-11-2017, 01:29 PM   #11
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If it's pissing from the kindeny grills doubt it's a hose. Also wasn't covered by warranty. In his case a rock pierced it.
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      06-11-2017, 01:35 PM   #12
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If it's pissing from the kindeny grills doubt it's a hose. Also wasn't covered by warranty. In his case a rock pierced it.
It's not. It was pissing from the under trays behind the radiator that faces the ground.

Also coolant up top around the plastic cowl cover and a little bit on the top of the forward facing rad. Look like it sprayed around which would make sense if it was a split hose under pressure.[IMG][/IMG]
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      06-11-2017, 01:40 PM   #13
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It's not. It was pissing from the under trays behind the radiator that faces the ground.

Also coolant up top around the plastic cowl cover and a little bit on the top of the forward facing rad. Look like it sprayed around which would make sense if it was a split hose under pressure.[IMG][/IMG]
Ahh ok. Hope it's an easy fix!
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      06-12-2017, 01:13 PM   #14
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Update shop said bolt came loose from my BMS intake and punctured the radiator. Think it got sucked up by the fan shot into the rad. $1500 to replace the fucker ($400 part and 7.5 hours labor). Obviously I am out of pocket on this as warranty won't cover it do to aftermarket intake.

Shitty part is I never installed the intake the PO did and they came with the car.
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      06-12-2017, 01:29 PM   #15
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That...is..so..weak. sorry to hear that.
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      06-12-2017, 01:46 PM   #16
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insurance claim that bitch! say a rock it it.
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      06-12-2017, 02:04 PM   #17
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insurance claim that bitch! say a rock it it.
Lying is always justified today, isn't it?
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      06-12-2017, 02:24 PM   #18
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Lying is always justified today, isn't it?
didn't say it was justified. to each their own morals
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      06-12-2017, 05:14 PM   #19
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Nah I am not going to lie and I can afford it so no big deal...shit happens.

Odd too because when I was trying to see what was leaking the front intake was loose and almost coming out of the accordion pipe by the passenger headlight. I didn't know how tight it was or should be but I thought it was strange that I could pull it out with little to no effort.

Still don't know which bolt either, I asked my SA to send me a picture of the carnage but nothing yet. Might stop by tomorrow and have a look.

Last edited by f80er; 06-12-2017 at 05:21 PM..
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      06-12-2017, 11:18 PM   #20
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Nah I am not going to lie and I can afford it so no big deal...shit happens.
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      06-13-2017, 09:52 AM   #21
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Cracked the case on this mystery.

Stopped by the dealer and worked with the SA/tech and service manager to find out where the bolt came from. Tech found it right up behind the front BMS intake and it looks like it was picked up by the fan and shot into the rad.



But where did the bolt come from? They thought it was from the intake but we quickly ruled that out as there were a hand full of identical OEM bolts throughout the engine. There was an M4 parked right next to my car so we compared the two engine bays and it was plain as day where the bolt came from. Looks like PO took the brace off to put the intakes on, dropped that bolt down into the bay (base of RAD) and then used one of the torx screws from the airbox to bolt the brace back down. Then it sat there for 9k+ miles before it decided to make an appearance into the RAD.

The torx screw below should be the bolt above.

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