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View Poll Results: How many thermostats have failed in your car(s)
0 36 47.37%
1 33 43.42%
2 5 6.58%
3 0 0%
4 0 0%
5 1 1.32%
6 0 0%
7 or more 1 1.32%
Voters: 76. You may not vote on this poll

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Old 01-26-2011, 02:59 PM   #1
teamdfl
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Non-M thermostats, poll

How many thermostats have failed in your car or cars?


M52TU and M54 thermostats are a well known weak spot in BMW cooling systems. They usually fail open causing the car to run cold, usually throwing a check engine light. An OBDII code reader will show a P0128 (Coolant below regulating temperature). I don't know what the factory or Peake code is for this failure.

I had another one die this week. It failed closed while driving to work resulting in an instant overheat and steam display. I don't know if I damaged anything. A few more days of driving will be required before I know if I'm losing coolant due to a blown head gasket. My previous thermostats failed open.
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Last edited by teamdfl; 01-26-2011 at 03:01 PM. Reason: typo
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Old 01-26-2011, 03:06 PM   #2
KingBeef
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As far as I know I haven't had one fail. While I did get a P0128 code a week or so ago, my fan was running excessively at the time (which I found odd) and according to a tech I discussed it with, that was the cause of the code. It has not shown up since nor have I had any indications of abnormal running temperatures. How many total have you had fail?
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Old 01-26-2011, 04:52 PM   #3
Kubica
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My second t-stat is leaking, so I'll put a third in soon.

First one stuck open.
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Old 01-26-2011, 05:11 PM   #4
paraklas
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My actual thermostat never failed. It was the ecu controlled heating element which failed, to be more precise, one of the 2 wires that go from the connector to the element was cut. does this count as 1 or 0 failure
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Old 01-26-2011, 05:43 PM   #5
teamdfl
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The one that failed this week was #5 for me. A friend called me a freak of nature.
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Old 01-26-2011, 05:55 PM   #6
OrientBlau
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It didnt actually fail, but I had mine replaced with the updated thermostat around 50K for peace of mind.

Old part: 11530139877

New part: 11537509227
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Old 01-26-2011, 06:30 PM   #7
The_Don
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Quote:
Originally Posted by OrientBlau View Post
It didnt actually fail, but I had mine replaced with the updated thermostat.....
I did the same. I changed mine at around 80k as preventative maintenance.
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Old 01-26-2011, 07:33 PM   #8
Blocked Out
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None in 2 BMWs I owned (one M52Tu and one M54)and none yet in the one I own now(M54).

I have a brand new OEM thermostat siting in my basement,bought it when I put my Stewart WP in, as I heard many people experienced thermostat failure right after replacing wp to Stewart. 10kms(6k miles) later, still waiting for the original to give up but it wont.

Since we're there, I also have a new OEM expansion tank sitting right next to the thermostat in the basement, as I refuse to change it without seeing how long my original one can take. So far 180kms(112k miles), original thermo and ET.
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Old 01-26-2011, 07:34 PM   #9
TrickTizzle
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Zero.
I replaced it as preventive maint. @85,000 miles
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Old 01-26-2011, 07:34 PM   #10
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None so far Knock on wood.
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Old 01-26-2011, 07:59 PM   #11
bigdog2003_99
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one in each of my e46's, both were bad when i bought the cars
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Old 01-26-2011, 08:50 PM   #12
01330cifirstbmw
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Taking mine in next week for the 2nd time...
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Old 01-26-2011, 09:01 PM   #13
tootall
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6 years and 26K miles on the original, as far as I know.
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Old 01-26-2011, 09:10 PM   #14
Bake
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On my previous E46 I had a leaky thermostat replaced under warranty at around 20k miles. Never had another issue in the next 40k with that car or the 10k miles or so that I have had my ZHP.


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Old 02-04-2011, 03:27 PM   #15
teamdfl
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I appear to be the exception rather than the norm. I thought there would be more people with 3+ failed thermostats.

Oh well. I got 10 years out of the original battery, radiator, and coolant reservoir so I guess I'll consider the thermostats to be a small offering on the altar of crappy parts from Bosch/VDO/Behr/Siemens/Lucas/Tyco/ZF/Lemforder.
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Old 02-04-2011, 03:28 PM   #16
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Old 02-04-2011, 07:36 PM   #17
Stickbuilder
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I replaced the first one at about 30K. I overhauled the entire cooling system a couple of years ago when the car was at about 55K. That one failed last week. It failed open, and I replaced it with a Wahler unit. I think that this was the same brand that I had used previously (both times). Never have had a thermostat issue before in almost 50 years of driving.
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Old 02-04-2011, 07:38 PM   #18
Devious1
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im at 130k and have only replaced it once at around 120k.
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Old 02-04-2011, 08:40 PM   #19
N89
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I replaced my original at 123,000 miles, not because it failed, but because I replaced it with a new one as preventative maintenance.
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Old 02-04-2011, 09:07 PM   #20
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Mine stuck open at 125k

Lasted pretty long I guess
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