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BMW 3-Series (E90 E92) Forum
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335i overheating issue?
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07-11-2020, 06:06 PM | #1 |
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335i overheating issue?
Hello everyone! New to the forum and BMWs, i recently bought a 2008 e92 335i MT with 53k miles.
Car is FBO with jb4 and mhd bef however i have flashed it back to stock. Ive replaced quite a few things and while i was at it noticed the coolant was neon green so i decided to change that right away. I flushed the coolant 4 times and finally filled with Zerex G48 50/50. Bled twice after. Was driving the car for about 3 days until it decided to overheat one day (limp mode and spilled out the expansion tank cap) Since then ive tried rebleeding multiple times, got a code for temp sensor so i replaced the sensor, no luck. Coolant looks fine and is full, water pump and thermostat are according to the previous owner new and appear to be working fine and the fans work, im kind of stumped! No leaks i can find or anything and trust me ive searched. Today i let the car idle until warm and watched coolant temps with mhd app, at idle it gets to about 221°f before the fan kicks on and maintains around that temp, but once i start driving as soon as i hear the turbos start spinning (not even boosting just spinning) the temp will rise up to 230 or 240 in around a second which seems insane to me? Could just be under light load and irrelevant to turbos. When i actually boost it doesnt change anything same rise in temperature as light load. After i got the yellow warning limp mode really only lasted 5 secs or so, i heard the fans kick in high speed and i drove back up the hill to my house no problem. Should i add new coolant incase theres some sort of restriction in there or is g48 possibly the issue? I couldn't find any bad info on it with n54s and again the coolant itself looks very clean. Last thing ill add is the car never overheated before i changed coolant but it was a fair amount colder outside than it has been since this issue started. Anyways, sorry this ran on so long, any help is appreciated, thanks! Last edited by Reide92; 07-11-2020 at 06:20 PM.. |
07-11-2020, 06:40 PM | #2 |
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Do this with a BMW Capable Code Reader: Delete all codesSure, water pump reputed to be new, but [click me] anyway. |
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07-11-2020, 06:54 PM | #3 |
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Thanks for the reply, i had already cleared codes prior to driving and was only left with a 2FDB shadow code. (Crankshaft sensor signal not plausible) i havent gotten any water pump related codes but after reading that forum im leaning toward replacing that and the thermostat, not too expensive and for all i know it could be the original pump and stat.
I read somewhere you can test your pump speeds with inpa has anyone had luck with that? Last edited by Reide92; 07-11-2020 at 07:01 PM.. |
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07-11-2020, 07:05 PM | #4 |
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07-11-2020, 07:13 PM | #5 | |
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And i added coolant and bled again after replacing sensor. Symptoms seem like air in the system but ive bled numerous times. |
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07-12-2020, 12:47 AM | #6 |
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Try cap on and the bleeder screw just barely cracked open to allow air to escape. You should get a little bit of coolant dribble out of it while the bleed procedure is running.
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07-12-2020, 03:34 AM | #7 |
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I had a similar situation when I bought my car, it would run fine for about 30 minute drive but anything farther than that it would overheat, turned out to be water pump not being able to run at 100%, new one fixed my issue. Another thing I would suggest checking is your battery voltage, these cars do weird things when they don't have the right amount of juice and I have heard the water pump does so as well. Though I'm not sure this is true it is just an easy thing to check for.
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07-12-2020, 09:55 AM | #8 | |
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I already ordered the pump kit so ill be doing it by next weekend and hopefully that does it! Thanks! |
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08-10-2020, 07:52 PM | #9 |
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Update, solved! New battery and no more overheating 😁. Also my jb4 was giving me strange seperate issues so uninstalled that too and the cars doing great!
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01-03-2023, 11:57 AM | #10 |
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New to the forums, cant figire out how to make my own post. Im currently having a similar issue with my 2013 335i, n55. New water pump and thermostat 2 years ago now, doesnt overheat during daily driving activities. I have a cobe tuner onboard to watch coolant temp as im driving, only over heats during prolonged pulls or sustained over 4k rpm. The weird part is it does not go into limp mode, the overheating light will come on around 250-260f°, as soon as the light comes on it goes away and drops back down to normal coolant temp araound 220° and i can continue driving. Checked the coolant, pump is working, thermostat is still somewhat new, did an oil change and there was no milk. Im at a loss and cant find any forums with this problem.
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01-12-2023, 12:58 PM | #11 | |
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335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod
MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava Last edited by Jaronbwall; 01-12-2023 at 01:04 PM.. |
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01-12-2023, 01:43 PM | #12 | |
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01-12-2023, 02:57 PM | #13 | |
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I would remove your intercooler, flush the system, refill the coolant, bleed, and see what happens. Just keep reusing the new coolant until you find the issue. That's really all you can do. haha
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335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod
MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava Last edited by Jaronbwall; 01-12-2023 at 03:05 PM.. |
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