Yep - friend had same model and overheating issue, it was a loose radiator hose caused fluid loss and overheating...seems to be a known issue.

Feb 28, 2021,17:14 PM
 

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2015 M235i starting to overheat during my drive home from Costco.

 
By: K-Lo : February 28th, 2021-16:29
I am the only owner about 57k miles, what’s your guess? Headed to the shop now, Yes!!! Not!!! Got some pizza near Villanova University while waiting for my ride after my car got towed... ...  

Oh man, sorry to hear that! If I had to guess, cracked/leaking radiator

 
By: Fastwong : February 28th, 2021-16:45
I feel like BMW has had issues with the plastic radiator connectors forever and 60k miles sounds about right for a new one..... It sucks but at least it's an easy replacement and good for another 50-60k miles.

I wouldn't stress. Head gasket really unlikely, that would have shown other issues.

 
By: Fastwong : February 28th, 2021-19:00
Probably the plastic rad or as mentioned below plastic water pump. So long as you stopped driving once you saw the temps get warm engine should be fine. Unless you want to tell your wife you"need" a new car. Then definitely head gasket 😂

Hahaha, per your last comment about a new car, I do want one....

 
By: K-Lo : February 28th, 2021-19:11
But, my wife, and I love her for it, says she rather me buy a watch than a car cause of depreciation of most cars in general.. But yeah, I am thinking something minor also... Ted

Cooling system was a common weak point for BMW cars for years.

 
By: vitalsigns : February 28th, 2021-18:26
Certainly better on newer cars, and 57K miles is very early, but my guess is a water pump failure (could be a temp sensor too, but they are designed to fail open and therefore lead to overcooling instead of undercooling). This usually doesn't happen until... 

Thank you for you insight John! My good Sire...

 
By: K-Lo : February 28th, 2021-18:36
Yes, I hope it’s not too expensive a fix. I really love driving this car, enough power, but not too much power, can drift if you want to. I had the limited slip differential installed to help with drifting when I bought it😁😁😁😁

+1. Most likely cooling system.

 
By: patrick_y : February 28th, 2021-20:03
Your M235i has an electronic water pump if I recall correctly. If the pump fails, there's no warning light until the engine reaches a critical temperature. A warning light would come on only if the thermostat is working correctly. On a BMW 545i I used to ... 

I had my 335 overheat 2 months ago and it was the electric water pump!!

 
By: Sandgroper : February 28th, 2021-22:47
BMW apparently installs electric water pump to gain/save few HP, strange idea and not worth it. Hopefully it will only be a small and cheap problem to solve. Cheers, Francois

I remember

 
By: Weems@8 : March 1st, 2021-03:39
you owned a Honda? Acura the same, any better there isn’t. But i have the same problem as you, staring blind on an emblem of a German car maker. In my case i adore Porsche, but i know also the technical failures Porsches have. So, when i go for my first P... 

My Mrs. drives a 335ix Coupe. DO NOT PAY to have this fixed.

 
By: HighEndOne : March 1st, 2021-05:52
If I recall correctly, if you are in the USA, there is a class action suit about the electric water pump failures. I have a letter about this somewhere from the lead litigator. Check around. All the best... HEO.

Busted water pump would be my guess..

 
By: AlexSunrise : March 1st, 2021-06:21
Glad you made the most of it and enjoyed a delicious looking pizza, Ted. Here’s hoping for a quick fix. Cheers, Alex