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Make of original thermostat
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09-20-2018, 04:47 PM | #1 |
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Make of original thermostat
I picked up an E91 with 110,000 miles on the clock. Purchased through a BMW dealer. Service history is not complete. Checking the water pump and thermostat I am unable to determine when it was updated. The thermostat had a Behre stamping. Is that a replacement or an original?
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09-20-2018, 10:51 PM | #2 |
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Unless it is not working i wouldnt worry about it. Replacing early is more of a convenience.
Personally, I do not like plastic parts, so I kept my original aluminum thermostat instead of replacing it. 140,000 miles, still working just fine. When they fail, they are designed to fail open so the worst that can happen is you get bad gas mileage. |
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09-21-2018, 05:02 AM | #3 |
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Thanks for the input.
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09-21-2018, 05:19 AM | #4 |
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If the t-stat is aluminum then it's original. If it is brown plastic, it was replaced with the updated part. As Hass said, it fails open and will not cause the engine to overheat. The t-stat is computer controlled to reduce start-up emissions, so it has a heating element in it. The common failure is the heating element stops functioning correctly. If that happens there will be a OBDII trouble code stored in the ECU and the SES light will come on.
Too many people read the internet and replace parts on these cars for no good reason other than to waste money. BMW = OCD for some reason. Wait for it to fail, it may never do so.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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09-21-2018, 05:56 AM | #5 |
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Lmao so true. But I think it may be because some people couldn't afford to have the car at a garage or sit at home for 1 to 4 days I guess and they need the car everyday.
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09-21-2018, 06:16 AM | #6 |
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Dont forget that some people will replace these parts while doing a different service that allows easier access to the water pump. For example (albeit an extreme one), I replaced the water pump and thermostat among other things when I did my engine swap. It didnt make sense to not replace them now with the easy access as opposed to waiting until they fail down the line and having to tear the car apart again.
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09-21-2018, 08:11 AM | #7 | |
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While there have been extreme cases of significant failure of components, I find the E90 pretty reliable and if anything needs to be replaced, it's usually something inexpensive and serviceable. |
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09-21-2018, 10:51 AM | #8 | |
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My 2 cents. |
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09-21-2018, 12:11 PM | #9 | ||
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While I'm not even close to you 300k+, I'm over 240k and have not run into any severe problems aside from the water pump and valve cover gasket. |
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