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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

Thread Tools Search this Thread Rating: Thread Rating: 4 votes, 5.00 average. Display Modes
Old 02-04-2011, 08:11 PM   #21
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Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,296
My Ride: '94 325iC & '00 323i
I have two M52s, and no t-stat troubles. I also had an M50 with no t-stat troubles, and now have a second M50 that I just replaced the t-stat because it stuck open.

Stuck open is a better failure than stuck closed, and I've had those before -- but not on a BMW.
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Old 02-04-2011, 09:15 PM   #22
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Location: Canberra, ACT, Australia
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My Ride: Ex 325CI owner
Slower to warm up and didn't quite make it to half way so replaced immediately.
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Old 02-08-2011, 08:39 AM   #23
Slow in, slower out
Join Date: Dec 1969
Location: Awesome, NJ
Posts: 4,646
My Ride: 325it
Originally Posted by Stickbuilder View Post
Never have had a thermostat issue before in almost 50 years of driving.
I have replaced thermostats in my collection of BMWs only a handful of times and only for preventative reasons until this M54. After nearly 100 years of conventional thermostat construction in the automotive industry, the technology seems pretty proven and reliable. Given the history of thermostats in cars, the failure rate of M54 thermostats is embarrassing. I cannot imagine what BMW, Behr, and Wahler are doing wrong.

I imagine it only gets worse in the N5x motors with their electric water pumps and thermostats buried in the engine.
Mod the driver. Participate in your local BMWCCA autocross or driving school. Have you joined BMWCCA yet?

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Old 03-24-2016, 01:31 PM   #24
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Join Date: Dec 2014
Location: Los Angeles
Posts: 14
My Ride: 2005 325i
Original thermostat stuck in "up" position after 9 years. Was diagnosed by "Service Engine Soon" code and electronic code reader. Indie shop replaced it, part was about $60, not sure what brand they used. No damage to car that I know of, apparently getting stuck in the "up" position had a cooling instead of overheating effect.
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Old 03-24-2016, 02:03 PM   #25
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Location: Oregon City Oregon
Posts: 572
My Ride: 99 328i, 00 Z3 2.8
I bought an m54 from a dealer that took it in on trade with an open thermostat. Otherwise, I have not experienced a failed thermostat on my two e39s or three e46s.

Last edited by SSchwab; 03-24-2016 at 02:04 PM.
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Old 03-24-2016, 02:55 PM   #26
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Join Date: Feb 2016
Location: Charlotte NC
Posts: 98
My Ride: 2002 BMW 330Ci
I've changed mine once. It was stuck open in summer so I didn't know for a little, so no big deal.

The one I have in now looks like its going to need to be replaced soon. See some grimy mist around it. My PS lines are leaking more so that's the main focus.
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Old 03-24-2016, 05:03 PM   #27
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Location: Chicago
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I have a replacement waiting in the basement, otherwise I'm on the original coolant system everything at 150k miles
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Old 03-25-2016, 06:45 AM   #28
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Join Date: Sep 2015
Location: Cincinnati OH
Posts: 279
My Ride: 2003 330xi Automatic
My car has over 215,000 miles on it and I just got a thermostat failure and had it replaced. Would stay open causing the car not to warm up properly. Now it appears to work flawlessly. I'm not the original owner of course, so who knows how many t-stats its had since it was born.
2003 330xi Two pedals, four door handles
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p0128, thermostat

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