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06-06-2015, 05:58 PM | #1 |
The Illustrious
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Which one is the coolant reservoir cap, and what is the other one????
I cant find anything in any manual or website that says what the hell the cap circled in red in my picture is. It looks like a typical coolant cap, but the cap circled in blue is supposed to be the coolant cap.
So what is what?? I got low coolant messages and when I checked the blue cap, it is already just above maximum. |
06-06-2015, 06:37 PM | #2 |
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I'm not sure about the red one but for sure the coolant is the blue one.
Do you get the message constantly? Let her cool down and see if the message is disappeared. I got the same message one time while the level of coolant was fine. After cooling down, never got it again...
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06-06-2015, 07:05 PM | #3 |
The Illustrious
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Message is constant. I cant find info anywhere on what the hell the cap in the red circle is. I may or may not have added some coolant to it before I realize the blue cap was the coolant cap... LOL. The one in red looks exactly like every other BMW coolant cap I've ever worked with in the last 20 years.
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06-06-2015, 07:29 PM | #4 |
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Just took it on a ~20mile ride up and down the highway, and the coolant temp error is gone. That other reservoir must have done the trick?
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06-06-2015, 07:38 PM | #5 |
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I don't think so. Must have been a glitch.... As I said I got the message one time ...
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06-06-2015, 07:47 PM | #6 |
The Illustrious
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The glitch tuned on after a 'sprited' run yesterday, and lingered through the evening. Came on again this morning when my wife drove the car after it cooled down overnight, and even for me when i went to check it out after letting it sit for a few hours to cool. I added about just under a half a liter of bmw coolant to the red circled cap
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06-07-2015, 07:39 AM | #7 | |
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06-07-2015, 09:25 AM | #8 |
Perennial PFC
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I hadn't known there was a separate cooling circuit for the DME so I looked in the owner's manual to see if they specify that system. It certainly makes sense that there is one, but the engine cooling is definitely the blue circle, at least according to page 179 in the manual. I'd guess the DME cooling is handled by the cap in the red circle. At least it would take the same fluid (again, I guess) and isn't power steering or something else! Half a liter is a fair amount to add, have you noticed any fluid on the ground? Maybe a leak?
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06-07-2015, 02:15 PM | #12 |
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Most of the new models now have 2 separate cooling systems.
Even 3 series will have this with the new facelift B48/B58 engines from July
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06-07-2015, 02:20 PM | #13 |
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Sorry, I didn't think of the page changes that might happen over the different years. I have a 2013. I'd assume whoever labeled the diagram you posted just reversed the two labels and we can hope the red circle identifies the DME cooling system that you mentioned. Is there anything in your owner's manual that mentions the separate DME/intercooler cooling system? I haven't found anything in my 2013 manual.
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06-07-2015, 04:16 PM | #16 | |
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06-07-2015, 04:24 PM | #17 | |
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06-07-2015, 05:01 PM | #18 |
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Wrong again, but nice guess. You think both the owner's manual and tech manual are wrong? Here are pics from under my hood. BOTH have warning symbols. Clearly the one on the left is a low pressure reservoir cap (DME/intercoolers) while the one on the right is a high pressure engine coolant cap.
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06-07-2015, 05:07 PM | #19 | |
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Charge air and DME cooler is on the left of the picture with the small coolant tank. Engine and turbo coolant fill cap is on the right with hidden large expansion tank
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06-07-2015, 05:37 PM | #20 | |
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