Overheating issues

NFiftyWon · 12-12-2018, 12:50 AM

Hi all,

Today my e90 n51 LCI decided to give me a high temp indicator and severely limit my speed while going down the interstate. I pulled over and inspected the engine bay.
The radiator and the fan were definitely working. It was blowing a respectable amount of cold air, enough so that when i tried to turn on the heat in the cabin to help expel some heat it only blew cold air. My coolant was low but there was still some in there. I topped it off, reset the computer and started to drive again. Instantly the fan kicked on full force. The engine bay didnt appear to be very hot. The cap caps came off with a little pressure but no immense heat. Just trying to get an idea of what could be the cause of this as i have not really run into heat issues with cars before. Any info would be of help.

robthewrench · 12-12-2018, 07:01 AM

Waterpump. No heat in the cabin is a big clue. The engine is hot, but no hot coolant is circulating. You also said no heat in the radiator, so again hot coolant is not getting circulated.

Bavarian Tech · 12-12-2018, 07:25 AM

More than likely, your water pump is begging to fail.

Efthreeoh · 12-12-2018, 08:32 AM

We cannot say it enough... scan the car with a BMW scan tool. It's most likely the pump. A scan will confirm. Look for 2E81/2E82 codes.

E82Derek · 12-13-2018, 08:06 AM

Sounds like a water pump fail. Like Efthreeoh said, scan the car and see what codes it throws

12-12-2018, 12:50 AM	#1
NFiftyWon Second Lieutenant 97 Rep 239 Posts Drives: E90 LCI 328 X-Drive Join Date: Jun 2017 Location: Colorado Springs iTrader: (0)	Overheating issues Hi all, Today my e90 n51 LCI decided to give me a high temp indicator and severely limit my speed while going down the interstate. I pulled over and inspected the engine bay. The radiator and the fan were definitely working. It was blowing a respectable amount of cold air, enough so that when i tried to turn on the heat in the cabin to help expel some heat it only blew cold air. My coolant was low but there was still some in there. I topped it off, reset the computer and started to drive again. Instantly the fan kicked on full force. The engine bay didnt appear to be very hot. The cap caps came off with a little pressure but no immense heat. Just trying to get an idea of what could be the cause of this as i have not really run into heat issues with cars before. Any info would be of help.
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12-12-2018, 07:01 AM	#2
robthewrench Captain 266 Rep 952 Posts Drives: 11 E90 335i Join Date: Aug 2014 Location: Columbus OH iTrader: (0)	Waterpump. No heat in the cabin is a big clue. The engine is hot, but no hot coolant is circulating. You also said no heat in the radiator, so again hot coolant is not getting circulated. __________________ bone stock
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12-12-2018, 07:25 AM	#3
Bavarian Tech Major 267 Rep 1,203 Posts Drives: 335i Join Date: Jan 2007 Location: Pittsburgh/Harrisburg iTrader: (15) Garage List 2006 330i [10.00]	More than likely, your water pump is begging to fail.
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12-12-2018, 08:32 AM	#4
Efthreeoh General 17276 Rep 18,719 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	We cannot say it enough... scan the car with a BMW scan tool. It's most likely the pump. A scan will confirm. Look for 2E81/2E82 codes.
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12-13-2018, 08:06 AM	#5
E82Derek Enthusiast 6 Rep 28 Posts Drives: 2008 BMW 135i E82 Coupe (N54) Join Date: Nov 2018 Location: Tampa, Florida iTrader: (0)	Sounds like a water pump fail. Like Efthreeoh said, scan the car and see what codes it throws
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