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X3 E83 (2004 - 2010)
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  #1  
Old 03-21-2016, 11:16 AM
Lauralai Lauralai is offline
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Thermostat question?

My 2007 suddenly overheated today, and forced me to stop on the side of the road.


There is no error code.
The heater blows cold air.

The temperature gauge suddenly jumped from center point to hot, the light came on, the car made a loud beep, and all power was reduced to nil. I pulled over. It was on a bad section of road, on a curve with no shoulder. I waited, and crept to a parking lot about a block or two from where this occurred. There I stopped the car and let it cool before traveling the remaining two to three blocks.

My question is: Is this my thermostat? Is there something else that would cause this?

I just replaced the starter this Saturday, and it was driving fine until Monday mid morning.
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  #2  
Old 03-21-2016, 11:32 AM
R ODonnell R ODonnell is offline
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Quote:
Originally Posted by Lauralai View Post
My 2007 suddenly overheated today, and forced me to stop on the side of the road.


There is no error code.
The heater blows cold air.

The temperature gauge suddenly jumped from center point to hot, the light came on, the car made a loud beep, and all power was reduced to nil. I pulled over. It was on a bad section of road, on a curve with no shoulder. I waited, and crept to a parking lot about a block or two from where this occurred. There I stopped the car and let it cool before traveling the remaining two to three blocks.

My question is: Is this my thermostat? Is there something else that would cause this?

I just replaced the starter this Saturday, and it was driving fine until Monday mid morning.
Most likely your water pump. It electric and on the outside of the engine. Google "N52 water pump".
If it is you should replace the thermostat at the same time.
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  #3  
Old 03-21-2016, 12:10 PM
Lauralai Lauralai is offline
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Quote:
Originally Posted by R ODonnell View Post
Most likely your water pump. It electric and on the outside of the engine. Google "N52 water pump".
If it is you should replace the thermostat at the same time.
Thank you, I think you're right.
Does the water pump not throw an error code when it stops working properly?
I saw no check engine lights...just sudden overheating.

I was thinking after reading about the thermostats that the water pump should probably be replaced. I'm really not looking forward to it, as the starter gave me a fit, just being able to reach things...
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  #4  
Old 03-21-2016, 01:45 PM
x3brian x3brian is offline
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Quote:
Originally Posted by Lauralai View Post
Thank you, I think you're right.

Does the water pump not throw an error code when it stops working properly?

I saw no check engine lights...just sudden overheating.



I was thinking after reading about the thermostats that the water pump should probably be replaced. I'm really not looking forward to it, as the starter gave me a fit, just being able to reach things...

Those symptoms are precisely what the water pump does when it fails. It's designed to do that to prevent the aluminum block from overheating.

It throws a BMW specific code not a CEL. Your CEL was the red over heat indicator on your temperature gauge.

If you do it yourself plan about 4 hours and about $350-$425 or so for coolant and a new pump. While in there replace the thermostat for about $150 more...you have to remove it to get to the pump.

Expect a dealer to charge between $1150 to $1400 for parts and labor.
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  #5  
Old 03-21-2016, 01:53 PM
Lauralai Lauralai is offline
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Ahh. I was planning on buying the pump thermostat and coolant and doing it myself.
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  #6  
Old 03-21-2016, 01:57 PM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by Lauralai View Post
Ahh. I was planning on buying the pump thermostat and coolant and doing it myself.
It's a "fun" job. If not done recently, consider doing the expansion tank too while you are at it. And any hoses that are soft or old.
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  #7  
Old 03-21-2016, 02:40 PM
Lauralai Lauralai is offline
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I already replaced the expansion tank. I hope it's not as "fun" as replacing the starter. :-/
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  #8  
Old 03-21-2016, 02:45 PM
R ODonnell R ODonnell is offline
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Quote:
Originally Posted by Lauralai View Post
Ahh. I was planning on buying the pump thermostat and coolant and doing it myself.
Some advice to make the job go easier. Put the front of the car on jack stands with it high enough to easily get under and remove the right front tire.
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  #9  
Old 03-21-2016, 02:49 PM
BMWaufKS BMWaufKS is offline
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And remove the radiator fan -- easy, peasy and get lots of room. Water pump and t-stat come out toward the radiator; t-stat first. Be sure to order/get new bolts for the water pump; they are aluminum and sometimes come with the pump.
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  #10  
Old 03-21-2016, 02:51 PM
R ODonnell R ODonnell is offline
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Originally Posted by Lauralai View Post
Ahh. I was planning on buying the pump thermostat and coolant and doing it myself.
If you don't go with BMW parts be sure to buy a Wahler thermostat and Pierburg pump. Both are made in Germany and are probably exactly what came on the car minus the BMW logo.
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  #11  
Old 03-21-2016, 03:40 PM
Lauralai Lauralai is offline
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I always buy OEM. Question, is there a fuse I can check and rule out before going ahead with a much more expensive project?
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  #12  
Old 03-21-2016, 04:01 PM
BMWaufKS BMWaufKS is offline
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I always buy OEM. Question, is there a fuse I can check and rule out before going ahead with a much more expensive project?
Yes!

Now which one is the question ... have your fuse card (likely in your glove box)?
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  #13  
Old 03-21-2016, 04:10 PM
Lauralai Lauralai is offline
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I have the fuse card, though it isn't overly helpful lol
It is in the glove box. I don't know which one it is. The card is confusing. Not sure which symbol is supposed to stand for the water pump.
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  #14  
Old 03-21-2016, 04:10 PM
Lauralai Lauralai is offline
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I've checked the owner's manual but can't find a correlating symbol
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  #15  
Old 03-21-2016, 04:54 PM
dukedkt442 dukedkt442 is offline
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I did the water pump a year ago and it was cake, actually fun. No need to remove any wheel, I couldn't see how it would have made the job any easier.

Removing the fan should be the first thing anyone does when doing any work on a BMW other than air filter and spark plugs. I thought that was obvious by now.
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  #16  
Old 03-21-2016, 05:05 PM
R ODonnell R ODonnell is offline
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Originally Posted by dukedkt442 View Post
No need to remove any wheel, I couldn't see how it would have made the job any easier.
Easier to see/reach the hose clamps. You're literally staring straight at them with nothing in the way. Well worth the additional effort in my opinion.
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  #17  
Old 03-21-2016, 05:42 PM
Lauralai Lauralai is offline
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Thank you for all the input! I will be doing it this weekend. Provided the parts arrive on time.
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  #18  
Old 03-21-2016, 06:11 PM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by R ODonnell View Post
Easier to see/reach the hose clamps. You're literally staring straight at them with nothing in the way. Well worth the additional effort in my opinion.
And with an air gun/impact sockets, and the vehicle already lifted, it doesn't take much elbow grease.
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  #19  
Old 03-21-2016, 07:03 PM
dukedkt442 dukedkt442 is offline
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It was literally effortless to get to the hose clamps in the first place; with the vehicle already on ramps, there was absolutely no reason to go through the added effort for zero return. But then, clearly I'm of the mindset that even a jack is too much effort.
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  #20  
Old 03-21-2016, 08:06 PM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by dukedkt442 View Post
It was literally effortless to get to the hose clamps in the first place
Depends which way some of them were installed ('clocked"). And definitely much harder to get to both the WP and t-stat on the X3 than in BAVauto's video due to the X3's crossmember.
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  #21  
Old 03-22-2016, 03:32 AM
abscate abscate is offline
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Are the clamps even clockable on the n52? On the M54, the connects are bayonet Oring which are fixed, very high quality. I'd be surprised if they switched. Pull the shroud, though, it makes life really easy
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  #22  
Old 03-22-2016, 04:12 AM
BMWaufKS BMWaufKS is offline
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Originally Posted by abscate View Post
Are the clamps even clockable on the n52?
Yes, there are worm clamps on some (most?) of the hoses connected to the WP and t-stat.
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  #23  
Old 03-22-2016, 05:28 AM
dukedkt442 dukedkt442 is offline
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Mine were factory clocking (original pump and stat).
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  #24  
Old 03-26-2016, 05:02 PM
Lauralai Lauralai is offline
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Well, I did the job today. It was easier than replacing the starter, and it was a lot better than paying someone $1100-$1500 to do it for me.
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