43 votes
Notice the radiator is leaking. Replace that. Car still not happy, cooling fans on full blast. Codes point to a thermostat, but the radiator hoses get warm. In my pea brain thermostats don't normally just sometimes go bad, they're typically either all broke or not broke. Ordered a thermostat from Trumplandia anyways.
The gasket looks fine. Normal procedure would be to buy a new one from BMW. always go OEM with the thermostat, there's a lot of shit knockoffs.
I recently moved on from a 2016 X3 35i (N55) with a little over 100k miles on it. The only things to break on it were the thermostat and a control board for one of the headlight modules. When I replaced the thermostat I did the water pump as a precaution.
My 535i with the 740d thermostat sits at 90-95 during normal use, even sat stable at 95c during 40c weather in traffic. When beating on it in the mountains got it up to 99 at like 28c ambient.
I have this exact engine and installed a diesel thermostat. Previously, with the standard thermostat, the plastic timing chain guides would start to disintegrate after three years, but now I have no problem with that. The engine temperature is around 96°C.
I bought from FCP euro one of the OE water thermostat and water pump. The thermostat sticks open since new so I get check engine light on my M54 engine.
Thermostat is an bmw part so its fine
I have had brand new bmw thermostats not work and cause my car to get hot on the highway.
I bought a 2022 X4 about a month ago from BMW. Had it for 2 weeks and got the same notification. Took it to BMW ( I got the warranty) and adjuster came in from the warranty people on Monday but haven’t approved the repair yet. They said it was also a thermostat. Seems like this is a common thing in these cars ? Mine is at 61k miles, bought it used and only had it for 2 MF weeks.
03’ E46 318ci with 130k miles and no issues with the whole cooling system. Neither the thermostat.
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The brand is registered in Germany.
In March 2026, PartReview users have a mixed opinion of OEM BMW thermostat.
PR Score — 60 out of 100, based on 14 reviews and 43 votes. 8 positive reviews, 1 neutral review, 5 negative reviews. Average rating — 3.1 (out of 5). Vote balance: 26 up, 17 down.
In the ranking of the best thermostat this part is at position 9, behind Motorcraft and OEM Audi , but ahead of Duralast and OEM Mazda.
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There are 14 comparisons of OEM BMW thermostat with other manufacturers on PartReview.
In particular, see which thermostat are better: OEM BMW or Motorcraft, OEM BMW or OEM Honda, OEM Audi or OEM BMW, MOPAR or OEM BMW, OEM BMW or AISIN .
