[mp255]

Reposting here for visibility

Hi Everyone! I picked up a 2011 335i E93 a few months back so I could have a cheap convertible on nice days, and I have started to have issues with the car running hot.

Bought with 56k miles, and currently sitting at 58k.

Since owning I have done the following:
- Aluminum charge pipe
- Larger FMIC
- TCU tune
- MHD stage 2 tune
- Replaced spark plugs (NGK 1 step colder)
- Replaced coil packs (Dinan)

I noticed that the car would intermittently start running hotter than normal. I would normally be at 210-220, and the car would start getting up to 245-250, and then i got the overheating warning. I checked for codes and had the following:

378F - BSD, message; electric coolant pump: missing.

I replaced the water pump with a Pierburg all aluminum pump and Wahler Thermostat.

After replacing, the cars temp stays at 246-250 now instead of the previous normal temp of 210-220. I haven't received a overheating warning yet, but also have not been driving very aggressively. Coolant temp is at 228-230

Side note - when i did the coolant bleed process, the bleeding process never stopped. Most things that I have read stated the the pump will stop after about 12 minutes, but 15+ minutes later, the pump was still going.

Any thoughts?

[lookalikehuuh]

So the oil temp gauge on the dash, is actually supposed to be around the 240-250F for oil temps. That is normal operating temp, especially if you are sitting in traffic. Water temps appear fine to me as well.

Maybe your old failing pump was overrunning and overcooling the car before it flat out failed? Did you happen to check the water pump grounding bolt when replacing the water pump? I know on certain cars, there was an issue with that bolt would have a bad contact and cause weird issues with the pumps. The ground bolt is on the front bottom of the engine block right above the water pump.

Have you checked for any codes, especially shadow codes since those can give you a good indication of whether everything is working as expected.

You can purchase a lower temperature oil thermostat that can be added to the OFHG that opens to the external oil cooler sooner.

https://www.fcpeuro.com/products/bmw...4aAqt1EALw_wcB

I personally have an aftermarket Stett performance larger oil cooler since my car didn't come with a factory oil cooler like newer cars did. So I never see oil temps above 225F, but I'm the exception.

Something of note, in early 335i, the oil temp gague's middle point was 210F, so of course it caused a lot of confusion for owners when they were seeing oil temps beyong that middle point. Most cars would sit at 3/4 of the way to the top of the gauge. So BMW revised later cars to have a 250F mid point for oil temps to cause less confusion for owners.

[mp255]

Originally Posted by lookalikehuuh

So the oil temp gauge on the dash, is actually supposed to be around the 240-250F for oil temps. That is normal operating temp, especially if you are sitting in traffic. Water temps appear fine to me as well.

Maybe your old failing pump was overrunning and overcooling the car before it flat out failed? Did you happen to check the water pump grounding bolt when replacing the water pump? I know on certain cars, there was an issue with that bolt would have a bad contact and cause weird issues with the pumps. The ground bolt is on the front bottom of the engine block right above the water pump.

Have you checked for any codes, especially shadow codes since those can give you a good indication of whether everything is working as expected.

You can purchase a lower temperature oil thermostat that can be added to the OFHG that opens to the external oil cooler sooner.

https://www.fcpeuro.com/products/bmw...4aAqt1EALw_wcB

I personally have an aftermarket Stett performance larger oil cooler since my car didn't come with a factory oil cooler like newer cars did. So I never see oil temps above 225F, but I'm the exception.

Something of note, in early 335i, the oil temp gague's middle point was 210F, so of course it caused a lot of confusion for owners when they were seeing oil temps beyong that middle point. Most cars would sit at 3/4 of the way to the top of the gauge. So BMW revised later cars to have a 250F mid point for oil temps to cause less confusion for owners.

Ah ok amazing. Thank you for the quick response! I was getting conflicting answers on oil temp ranges, and it was giving me anxiety every time i drove it because it was approaching 250. lol

[mp255]

Also figured out why the coolant bleed wasn't finishing - I hooked it up to a battery tender and tried again and it stopped right around that 12 min mark.