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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 04-19-2014, 12:23 AM
eric49a eric49a is offline
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faulty cooling system component?

So driving along the other day and suddenly I get a warning on my idrive saying engine hot! Drive moderately. But my oil temperature Guage wasn't even at operating temperature yet. This happened only a few blocks from my house on my way back home. So I thought I would just finish getting home. Then about a block from my house the yellow warning turns red saying engine over heated! Stop driving. And the car went into limp mode. So I pulled over and shut the engine off. Let it sit for a few minutes. The engine oil temp gage was still below operating temperature. Start the engine up again and engine seems normal. Drove home and started googling what the problem could be and I came up with low coolant, failed water pump, failed thermostat or failed coolant temp sensor. So I start trouble shooting. I notice that if I start my engine after letting the car sit all night at about 0 degrees Celsius outside. The radiator fan starts spinning at full speed. Which seems like a bad coolant temp sensor. Also I turned the water pump on by turning the car on and pushing the gas pedal to the floor for 10 seconds. I could hear the water pump spinning, I opened the coolant resivuar and could see coolant slowly flowing and that the coolant level was in between low and max with a cold engine, so it's not low coolant, and the water pump is moving water so it doesn't seem like that either. And I also noticed that while driving for a bit I'll stop getting hot air in the cab and it'll start blowing colder air. If I keep driving the engine temperature warning will come up. If I shut my engine off when it starts blowing cold air in the cab and start it back up the air will get warm again. So it seems to me that I have a faulty coolant temp sensor. Does that diagnosis seem correct to every one else? I want to get some more input before I go order one.

Edit: I also tried scanning for codes but didn't get any. However I only have a cheap 100 dollar code reader. I tried scanning for codes with the car just on like normal and when I got the engine hot warning. Couldn't get any codes

Last edited by eric49a; 04-19-2014 at 01:15 AM.
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  #2  
Old 04-19-2014, 06:45 AM
fdriller9 fdriller9 is offline
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You have a failing water pump. Repalce the Tstat while you're there.

If you keep overheating the engine, you will blow the gaskets.
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Old 04-19-2014, 08:05 AM
White94RX White94RX is offline
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+1 time for a water pump

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Old 04-19-2014, 12:36 PM
eric49a eric49a is offline
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Ok but why would a failing water pump cause my radiator fan to spin full speed as soon as I start my car with a stone cold engine?
And if my engine was overheating from coolant not being circulated that would show up on the oil temperature gauge. Would it not?

Last edited by eric49a; 04-19-2014 at 01:07 PM.
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Old 04-19-2014, 02:48 PM
White94RX White94RX is offline
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No. You need a water pump. When they fail, they store a fault code in the dme and it turns on the fan wide open even on cold start. Trust me. You need a water pump

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Old 04-19-2014, 02:50 PM
eric49a eric49a is offline
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Ok that makes sense. Thanks for the input guys!
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Old 04-19-2014, 03:37 PM
hondo402000 hondo402000 is offline
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Quote:
Originally Posted by eric49a View Post
Ok but why would a failing water pump cause my radiator fan to spin full speed as soon as I start my car with a stone cold engine?
And if my engine was overheating from coolant not being circulated that would show up on the oil temperature gauge. Would it not?
No oil temperature and coolant temperature are not related. The coolant will get hotter faster than the oil. Coolant cools the engine head oil is not a coolant
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Old 04-19-2014, 06:02 PM
ctuna ctuna is offline
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Very common failure for these.

Very common failure for these.
Don't drive the car and get it fixed pronto
if you don't have 10k to spend on and Engine.
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Old 04-19-2014, 07:04 PM
eric49a eric49a is offline
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Thanks everyone I'll be ordering a new water pump pronto. Is it weird that I'm not getting a check engine light from this though?
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Old 04-19-2014, 07:50 PM
White94RX White94RX is offline
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No. That's normal.

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Old 04-19-2014, 08:19 PM
ctuna ctuna is offline
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Get a Thermostat to

Get a Thermostat to

DIY's are here in the DIY section and there are some on ytube to I think.

http://www.e90post.com/forums/forumdisplay.php?f=16
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Old 04-19-2014, 08:40 PM
Zoomie94 Zoomie94 is offline
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Yep, no warning on mine either when the water pump went out. Good luck with your repair.
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