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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-04-2010, 12:48 PM
Blah937 Blah937 is offline
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Engine Overheating, Could it be the thermostat?

Does anyone know how I can tell if my engine is overheating because the thermostat is busted?


I have a 325i 06' with about 95k miles on it.

One thing that i've noticed is that I put in coolant and then when the engine tells me it's overheating the coolant level is almost completely gone. However, I took it to a mechanic and they couldn't find any leaks.

BUT! I see some coolant residue from my coolant container indicating coolant definitely splashed out. SO.....my question is......could that be a result from the thermostat?

That is what another mechanic said. But I don't really trust him.

How do I know if the thermostat is broken?

Thank you!
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  #2  
Old 05-04-2010, 12:55 PM
HPIA4v2 HPIA4v2 is offline
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Quote:
Originally Posted by Blah937 View Post
Does anyone know how I can tell if my engine is overheating because the thermostat is busted?


I have a 325i 06' with about 95k miles on it.

One thing that i've noticed is that I put in coolant and then when the engine tells me it's overheating the coolant level is almost completely gone. However, I took it to a mechanic and they couldn't find any leaks.

BUT! I see some coolant residue from my coolant container indicating coolant definitely splashed out. SO.....my question is......could that be a result from the thermostat?

That is what another mechanic said. But I don't really trust him.

How do I know if the thermostat is broken?

Thank you!
Thermostat normally close until it heats up so the easy test would be puting thermostat a pan (with cold water) then heat it up until water boils and see if it opens.

Sounds like you may have reservoir tank cap leaks, where coolant escape hence overheat the engine.

Did you take it to dealer? or indy shop?
Did you see any steam escaping when the engine over heat (open the hood)?
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  #3  
Old 05-04-2010, 01:03 PM
Blah937 Blah937 is offline
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Thanks for the reply! Reservoir tank cap leak...hm.... Do you know where I can find more information on that so I can check it out myself?

I took it to an indy BMW shop and another non-specialized indy shop. The BMW shop couldn't immediately find anything wrong with it and told me to come back and the other shop told me it's the thermostat.

And nope, there was no steam at all during overheating.
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  #4  
Old 05-04-2010, 01:07 PM
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mecodoug mecodoug is offline
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When my water pump went, it was running but running slow.
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  #5  
Old 05-04-2010, 01:29 PM
R1200 R1200 is offline
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An overheating engine is very obvious when you open the hood as there will be smells of a hot engine. Lots of oils and rubber stuff on the engine will give off odours that are not normal. Your nose will know if the engine is overheated.

If the thermostat is not opening the problem becomes acute quickly so I too would suspect a leaking cap or an over filled reservoir with no expansion room for your coolant loss problem.

In my experience the thermostat is usually the last suspect as it it such a simple device. Check the fins in the lower section of the rad to see if they are loose and maybe the cooling fan circuit if indeed you have an overheating problem.
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  #6  
Old 05-04-2010, 04:08 PM
HPIA4v2 HPIA4v2 is offline
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Quote:
Originally Posted by Blah937 View Post
Thanks for the reply! Reservoir tank cap leak...hm.... Do you know where I can find more information on that so I can check it out myself?

I took it to an indy BMW shop and another non-specialized indy shop. The BMW shop couldn't immediately find anything wrong with it and told me to come back and the other shop told me it's the thermostat.

And nope, there was no steam at all during overheating.
The thing that bugs me is that you loose coolant (from your first post).

Thermostat stuck close will cause the engine to overheat, but unlikely you'll loose coolant unless you kept on driving untill the overheat cause more damage and spewing coolant all over (reservoir tank cap being weak link for example).

If you really wants to find out, I'll top of the coolant again, idle the car outside the garage until the needle start moving pass the mid-point and shut the engine off imediately and check for leaks (around the waterpump, reservoir, thermostat). If you have leak cause by overheat you'll see it here.

Did you just flushed the cooling system recently? (trap air in the cooling system will cause overheat as well, and need to be bled out).
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  #7  
Old 05-04-2010, 04:19 PM
Blah937 Blah937 is offline
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Hmm......I will try that HPIA. Thank you! However, now the mechanic is telling me that I have a faulty water pump?!

IF it is indeed my water pump....doesn't that mean I don't need to replace my thermostat and that it is fine? I am thinking about doing all of it myself but I am not sure.....If anyone has any suggestions.....that would be great.
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  #8  
Old 05-04-2010, 10:42 PM
HPIA4v2 HPIA4v2 is offline
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Quote:
Originally Posted by Blah937 View Post
Hmm......I will try that HPIA. Thank you! However, now the mechanic is telling me that I have a faulty water pump?!

IF it is indeed my water pump....doesn't that mean I don't need to replace my thermostat and that it is fine? I am thinking about doing all of it myself but I am not sure.....If anyone has any suggestions.....that would be great.
I believe your 06 325i (N52 engine) has electric water-pump unlike the old belt driven, which is prone to bearing leak; not sure how robustthe elctric WP pump is honestly.

Unfortunately the stuck close thermostat and dead water pump has same symptoms.
In any rate I'll replace both @95K miles, you've got your money worth of the thermostat + WP at this mileage. It's not cool to replace whatever fail now and a month later the other part fails, unless you are kin to paying labor twice

Good luck.
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  #9  
Old 03-22-2011, 04:19 PM
JCC78 JCC78 is offline
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This problem , of overheat , are very common in the e90 . I don't know why .

I have a partner , with a 325i 06 , 50.000 miles and have this problem . need to replace the thermostat and the water pump . A lot of money !!!!
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  #10  
Old 03-22-2011, 05:36 PM
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The HACK The HACK is offline
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Someone who's a REAL mechanic is going to have to chime in on this one. But I remember long long time ago someone once told me that these newer BMW thermostats fail in an OPEN position, meaning that even if the thermostat fails it will only trigger a check engine light rather than make it go KABLOOEY.

Bet you internet cred that it's the electronic water pump, which is known for a lot of "gremlin" like behavior because, well, it's German electronics. As the engine "overheats" there's a release valve in the radiator that releases the excess pressure, that's probably why you're seeing low coolant after the overheating.
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  #11  
Old 03-22-2011, 09:28 PM
Tom K. Tom K. is offline
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[QUOTE=The HACK;5939152]Someone who's a REAL mechanic is going to have to chime in on this one. But I remember long long time ago someone once told me that these newer BMW thermostats fail in an OPEN position, meaning that even if the thermostat fails it will only trigger a check engine light rather than make it go KABLOOEY.[QUOTE]

And when it failed (in the open position as designed) on my E46, I only realized it when the weather turned cold and the water temp gauge (remember those?) would never reach normal.

Tom
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  #12  
Old 03-23-2011, 09:06 AM
BM32516 BM32516 is offline
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Quote:
Originally Posted by Blah937 View Post
Does anyone know how I can tell if my engine is overheating because the thermostat is busted?


I have a 325i 06' with about 95k miles on it.

One thing that i've noticed is that I put in coolant and then when the engine tells me it's overheating the coolant level is almost completely gone. However, I took it to a mechanic and they couldn't find any leaks.

BUT! I see some coolant residue from my coolant container indicating coolant definitely splashed out. SO.....my question is......could that be a result from the thermostat?

That is what another mechanic said. But I don't really trust him.

How do I know if the thermostat is broken?

Thank you!
I had the same problem with my car. I had to take it to the dealer because no mechanic could find the problem. Instantaneously the dealer was able to find out what was wrong, and fixed it. But I had to pay about 1grand because I had to get a new heating block
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  #13  
Old 03-23-2011, 03:04 PM
vivek_v_rane vivek_v_rane is offline
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Originally Posted by BM32516 View Post
I had the same problem with my car. I had to take it to the dealer because no mechanic could find the problem. Instantaneously the dealer was able to find out what was wrong, and fixed it. But I had to pay about 1grand because I had to get a new heating block
What's a heating block?
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  #14  
Old 12-02-2011, 10:08 AM
Herman11 Herman11 is offline
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Hi
I have a 2006 323i with 120k km on the clock.
The car started overheating recently.
So far we have replaced the thermostat, water pump and rad hose as it had a leak.

Any ideas what this could be?

I am extremely frustrated as the repair bill to date was not cheap.
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  #15  
Old 12-03-2011, 02:55 PM
JCC78 JCC78 is offline
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This problem are very usual . I have a 2 friend , 1 have a 325 whith 70.000 miles , and need to change the water pump and the thermostat . $800.00
and the other have a 335i cope only 40.000 miles , and need to change the same parts . I love my BMW , but this problem is very disagreeable .
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  #16  
Old 04-27-2014, 08:16 PM
thedonesco thedonesco is offline
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Need help car over heating

2008 335xi
Very embarrassing first date with a chick i like and my car over heats wont move
No smoke comming from under the hood thermostate on the dash normal and car wont move dont know whats going on please help
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  #17  
Old 04-27-2014, 08:28 PM
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galahad05 galahad05 is offline
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Are you getting the red engine overheating symbol on the dash?
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  #18  
Old 04-27-2014, 08:49 PM
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galahad05 galahad05 is offline
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Could very well be the water pump. Unfortunately you will most likely have to get it towed. Not a great first date circumstance, but I guess it's all in how you deal with it, and her.
"When life gives you lemons, make lemonade". Turn it into some sort of adventure thing.
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  #19  
Old 04-28-2014, 03:28 AM
thedonesco thedonesco is offline
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yes first yellow thermostat then red but when i was at the bank i notice a loud fan noise then shorty after the car wouldn't move
couldn't come at a worse time
with all work i usually go to bmw dealer but the nearest one is 1hr away from where Iam working
should i let a local shop do the work or should i go to bmw??
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  #20  
Old 04-28-2014, 07:19 AM
birdman15 birdman15 is offline
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a good indy shop knows of this water pump problem that BMW also knows about. Tomorrow I am doing this EXACT swap. t-stat & water pump. found a indy dealer literary NEXT door to me! I honestly did not know he was there as he is very low key and private.
T-stat
water pump ( bolt kit )
and proper coolant

I am at 50,000 miles
2008 328xi

I got the thermometer signal on the dash so I am not taking any chances. rather spend $1000.00 now than a new engine down the road......
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  #21  
Old 04-28-2014, 07:28 AM
thedonesco thedonesco is offline
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I called the dealer and the warranty expires april 30th in 3 days!!!! so my water pump will be covered under warranty i have to get the car towed only 200 bucks
god is good thanks guys
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  #22  
Old 04-28-2014, 07:29 AM
birdman15 birdman15 is offline
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wow!!!

what is the actual warranty details ?
years past or mileage?
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  #23  
Old 04-28-2014, 07:31 AM
birdman15 birdman15 is offline
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here is what it is in Canada:

BMW Warranties.
New Car Limited Warranty.
BMW Canada Inc. (BMW Canada) warrants to the first retail purchaser, and each subsequent purchaser, of Canadian specification vehicles imported by BMW Canada, or sold through the BMW Canada European Delivery Program to be free of defects in material or workmanship.

The warranty period is for 4 years or 80,000 kilometers, whichever occurs first, and begins on the date of first retail sale, or the date the vehicle is placed in service as a demonstrator or company vehicle, whichever is earlier.

Please see your authorized BMW Retailer for additional information on coverage and limitations.
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  #24  
Old 04-28-2014, 07:34 AM
thedonesco thedonesco is offline
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it 2008 335XI 6 speed i guess it was a pre own it had 6 year 100k warranty
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  #25  
Old 04-28-2014, 07:36 AM
birdman15 birdman15 is offline
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Originally Posted by thedonesco View Post
it 2008 335XI 6 speed i guess it was a pre own it had 6 year 100k warranty
lucky you!!! when getting it repaired as them if BMW has actually FIXED the water pump issue or just replacing it and in 50,000 miles you will have this problem again!
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