11-06-2020, 09:14 PM | #1 |
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2015 M235i overtemp warning
Fall temps in GA, car setting idle for roughly 15 minutes and I had the amber high temp indicator come on. First time seeing this and turned the car off immediately. The car has about 50k miles on it and from some of the other posts, it sounds as if it's going to be the fan or possibly the water pump. I've got some detective work to do to narrow it down to one or the other. The question I have is, are there any YouTube videos out there on how to replace the water pump and thermostat on this car. I couldn't find one but, maybe someone else out there had better luck. Thx
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11-07-2020, 07:40 AM | #3 |
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Yeah, definitely would change both at the same time. I couldn't find a diy video for the m235i but, I did see some specific to N55. Would the procedure be the same for all vehicles that have the N55 power plant?
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11-07-2020, 09:02 PM | #4 |
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Can't say for certain. But my guess would be yes. Good luck with the install if you decide to take on the task yourself. Update us with how it goes. I've heard mixed reviews. Obviously depends on an individuals capabilities, but some say it's not too bad others say it can be a pain.
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11-08-2020, 11:04 AM | #5 | |
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11-11-2020, 10:38 AM | #7 |
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I would be pulling some codes before replacing any parts. these cars aren't cheap to repair to just start throwing parts at it until something fixes it. could be the fan its self, could also be a software issue with the dme since the dme is what triggers the fan or could even be a dme its self. I doubt that it's a coolant pump just because the fan would generally be in full blast if you has a coolant pump low turbine speed fault. Find what the faults are first and post it up. if you got to do any driving with it I would suggest putting the cabin temp to full hot to help keep engine temps down
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11-12-2020, 07:58 AM | #8 | ||
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11-12-2020, 08:10 PM | #9 | |||
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11-16-2020, 07:53 AM | #10 |
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first thing i would check is the cooling fans manually spin them feel for any binding listen for any grinding noise. if they dont spin freely and noise free there is a problem. Next unplug the power connectors and apply 12 volts to the fan motor to see if it spins up to speed again look and listen. If these check out its time to look at the wiring to see if there is a fault there. I cant speak for how bmw wires these, most cars use a signal from a temp sensor to a relay to handle the work load of switching power on to the fan. It shouldnt take you more than a few minutes to run these checks. a quick tstat check is once the car has warmed up say around the 200 deg mark the upper and lower coolant hoses should both be hot to the touch or use an IR temp thermometer to check if you cant safely get to the houses.
Last edited by pmcmtnbkr; 11-21-2020 at 07:01 AM.. |
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11-18-2020, 06:41 PM | #11 |
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A bit of research in the repair manual which doesn't seem to have a TOC, I found that the DME feeds WPM signals to the electronics in the cooling fan which allows for varying fan speed. The fan spins freely and consistently kicks in once aed t about 228f and cools the temp down to about 216f before dropping out. From there, it consistently does not ever come back on but will jog back and forth which it was doing before the first complete cooling cycle. I was monitoring the fan relay the whole time which appears to kick in and provide battery voltage shortly after vehicle startup which means, the fan functionality seems to rely on the WPM signal from the DME exclusively. From what I can tell, I suspect the issue is the fan circuitry but, I would love to have this tested before dropping all that money on a new fan assembly.
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11-19-2020, 10:05 PM | #12 | |||
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vehicle will still set faults without triggering a c.e.l or control message. if the fan is turning on from the DME triggering it, then I would rule out the fan. reading codes im talking about DTC Codes. generally you will find a coolant pump turbine speed fault code stored. thats where I would be looking.
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11-20-2020, 09:25 PM | #13 |
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Just as I had suspected. Since the fan was not functioning in a consistent manner, I suspected it was a fan issue but, was not sure enough to pull the trigger on a fan assembly purchase. I scheduled the local dealer to run the diag check and they did find the fan to be faulty. Since they have the car, I'm just having them replace the fan assembly so I can get the car back on the road ASAP. I know, with about 47k miles on the car, I'll probably be replacing the water pump within a year or so but, at least there are videos on replacing that. I would definitely like to have the diag tool to see these trouble codes for future use.
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11-21-2020, 07:04 AM | #14 | |
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11-21-2020, 06:35 PM | #15 |
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Thanks. Yeah, had I been more patient, I would have purchased an aftermarket fan assembly and attempted to replace it myself, blind. Still would be interested in the app and dongle that would allow me to perform my own diagnostics at the same level as what the dealer had.
BTW, got a loaner 2020 330i, lots of tech but, miss the fun/power of my m235i. |
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11-21-2020, 07:37 PM | #16 | |
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Another thing for your BM3 Stage 1, I will recommend to get an intercooler if you don't already have one. |
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11-21-2020, 08:36 PM | #17 | ||
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12-16-2020, 01:51 AM | #18 | |
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Coolant/ Water Pump
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Otherwise, nearly all other videos and threads I've seen on coolant/ water pump failure and replacement have been on either the N54 or 2012 N55 variants and earlier. Very minimal F chassis info. I'm hoping that's good news and a sign of an improved design and much less common problem. Even replacement parts on various vendor sites have hardly any reviews. I'm at about 93K miles and am considering replacing it for peace of mind; but I'm also not trying to replace parts that aren't broken and am curious as to how long it will last - at the risk of getting stranded. I may buy the kit so that I have the parts readily available whenever it does fail. |
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12-16-2020, 10:37 AM | #19 | |
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The pics you posted are the garbage plastic pump on the early cars, ours our metal and seem to last much longer. |
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12-16-2020, 11:55 PM | #21 |
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I should have said clip not pic. I was looking at the date being a 2013 F30 which are the class action lawsuit pumps. If anyone is curious the lawsuit lists the models affected and ours is absent.
https://www.electriccoolantpumpsettl...-14-100944-000 I don't think people should be too worried about ours failing, there haven't been many people reporting issues so far. |
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