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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 08-15-2014, 10:25 PM
BMW318i_E36 BMW318i_E36 is offline
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Bought a 330xi, have a question !

I sold my E46 and recently bought an E90 330xi. Just wondering if the coolant is supposed to boil after a drive.
I open the hood after driving home (25km), open the hood, notice a boiling noise coming from coolant reservoir.
Any help?
Thanks
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  #2  
Old 08-16-2014, 12:03 AM
ctuna ctuna is offline
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Are you sure that's what it is ?

Are you sure that's what it is ?
The electric water pump will run briefly when you turn
the car off, could that be what your are hearing .
I would check the coolant level in the morning while the
engine is cold.
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  #3  
Old 08-16-2014, 01:11 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by BMW318i_E36 View Post
I sold my E46 and recently bought an E90 330xi. Just wondering if the coolant is supposed to boil after a drive.
I open the hood after driving home (25km), open the hood, notice a boiling noise coming from coolant reservoir.
Any help?
Thanks

Well, it is quite unusual for coolant to boil, what with boiling point elevation afforded by the glycol. Food for thought:

  • Perhaps your coolant level is low.
  • Maybe your water pump needs service
  • Thermostat not all it should be
  • How's your antifreeze level?
  • Codes?
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  #4  
Old 08-16-2014, 03:21 AM
BMW318i_E36 BMW318i_E36 is offline
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No codes, just opened the hood and there it was the boiling sound coming from or near the coolant
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  #5  
Old 08-16-2014, 05:52 AM
brewder brewder is offline
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Quote:
Originally Posted by BMW318i_E36 View Post
I sold my E46 and recently bought an E90 330xi. Just wondering if the coolant is supposed to boil after a drive.
I open the hood after driving home (25km), open the hood, notice a boiling noise coming from coolant reservoir.
Any help?
Thanks
You might want to flush the coolant... If this is a new-to-you ride, there's no telling what the prior owner did. Maybe there's an abundance of pure water in the system.
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  #6  
Old 08-16-2014, 06:18 AM
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DallasBimmer DallasBimmer is offline
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  #7  
Old 08-16-2014, 06:24 AM
fdriller9 fdriller9 is offline
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It's not normal or ok for any fluids to boil.
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Old 08-16-2014, 10:38 AM
Nerdboss Nerdboss is offline
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It sounds like a coolant flush is in your future. Perhaps something was added to the coolant reservoir that was not supposed to be added.
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  #9  
Old 08-16-2014, 10:54 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Quote:
Originally Posted by BMW318i_E36 View Post
No codes, just opened the hood and there it was the boiling sound coming from or near the coolant

You'll see when a code reader capable of BMW proprietary, hidden, and shadow codes is connected. Good bet they're there - not everything shows on the dash.
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Old 08-16-2014, 03:24 PM
fdriller9 fdriller9 is offline
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Open your oil filler cap and the coolant reservoir cap and inspect the fluids. DO THIS ON A COLD OR SLIGHTLY WARM MOTOR. IF IT'S HOT, COOLANT WILL SPRAY AT YOU AND BURN YOU.

Are the milky?
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  #11  
Old 08-16-2014, 05:53 PM
ewolr ewolr is offline
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Also, if you flush it, there is a special procedure to bleed the system before you run the car. I cant recall the steps but remember they involve turning the heater all the way up, turn the fan all the way down and I think you press the accelerator for 7 seconds or something like that. Google it and you will find. I had to do that when I changed my water pump and thermostat.
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  #12  
Old 08-18-2014, 12:04 AM
BMW318i_E36 BMW318i_E36 is offline
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I open the coolant reservoir and notice the coolant was very low. The red indicator was way under the cap. I added prestone all makes/models coolant (green) to bring it back to max. Funny thing, the whole colour came as green. I will be taking my car to my BMW mechanic Tuesday morning, and getting the system checked and the coolant changed with BMW coolant.
Think low coolant was causing boiling?
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  #13  
Old 08-18-2014, 10:17 AM
Porando Porando is offline
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Just Low coolant will not .. Really LOW will if there is also an air in the system.
Bad (always closed) thermostat would.... or if somebody used diluted coolant.
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Old 08-18-2014, 12:00 PM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by Porando View Post
Just Low coolant will not .. Really LOW will if there is also an air in the system.
Bad (always closed) thermostat would.... or if somebody used diluted coolant.
Diluted coolant (with distilled water) has better cooling efficiency than 50/50 or straight coolant.

The ONLY reason people have 50/50 mixes of water/antifreeze year round is for laziness/convenience.

Straight distilled water cools much better than any ratio mix with coolant. But of course if you put this in someone's car that has no idea about autos, it will crack your engine block in the winter.
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Last edited by fdriller9; 08-18-2014 at 12:01 PM.
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  #15  
Old 08-18-2014, 04:53 PM
BMW318i_E36 BMW318i_E36 is offline
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I filled it up it to the max yesterday night and now looked at it after work and it's back at the same level as when it was below min, but no warnings or smoke (knock on wood). Mechanic told me to put some water in there and bring it to him tomorrow.
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