This might sound like a dumb question but my previous car never did this.
So in the mornings when it's fairly cold and late at night my Z3 will get up to the normal tempature but as I drive faster around 45-60 mph it will drop to colder engine temp about a notch lower then normal then later it will go back to the middle the normal tempature the car does this all throughout driving is this normal? I've attached 2 pictures the first being the normal tempature it is normally at then second picture is how low it drops then will go back. The car will never go above the normal temp or overheat so that's a good start aha
Image 1: https://pasteboard.co/IfAoaZD.jpg
Image 2: https://pasteboard.co/IfAnS0C.jpg
I'm guessing this is cold air entering the engine since I'm going 60mph but just let me know if this is normal thanks guys
Sounds like you need to replace your thermostat
I think my thermostat works like it should I mean... at other times like 9am to 7pm my car will always hold normal temperature and it only moves at cold tempatures
whenever I get above 45mph it starts going down and it will hit the marked point in the picture about a notch down when I hit 60mph on cold mornings and cold nights
That's definately not normal. My 2.5 M54 is rock steady at 12 o'clock no matter what speed I'm going or what the outdoor temp is. The thermostat is there to maintain engine temperature. I don't think it is doing it's job.
It's a faulty thermostat buddy. Replace it
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100% faulty thermostat. No point asking if you aren't going to believe the obvious answer.
This seem right?
https://www.bimmerworld.com/Cooling/...537511580.html
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The thermostat is not telling you anything.
The ECU is telling the coolant temperature gauge what to display. And it tells the gauge to remain fixed vertical from the point where the engine is warmed up around 170F, to the point where overheating begins around 220F. If the needle is to either side of vertical, then you are being told that the engine is seriously out of normal operating temperature.
My needle was always straight up. But after I installed a digital coolant gauge on the console, I saw the temperature was rising and falling with driving conditions. It ranged from 195F in traffic, down to 170F when coasting down long hills. After installing a new thermostat, the temperature stayed at 206F under all conditions.
Last edited by Vintage42; 05-21-2019 at 07:16 AM.
BMW MOA 696, BMW CCA 1405
Running at colder temperatures is not good. Generally the fuel mixture is on the rich side (washing down the cylinders) and an engine can experience more wear due to excess fuel and cool engine components not being at operating temperature. Fuel mileage suffers and the catalytic converter is at risk by having too much fuel dumped in for too long of duration.
Depends.
Use the last seven of you VIN in www.realoem.com to determine part number requirements, then go shopping with that/those part numbers.
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Last edited by bluptgm3; 05-21-2019 at 09:26 AM.
Is this what im looking for?
2.8l m52 btw
https://www.fcpeuro.com/products/bmw...em-11537511083
im confused finding the thermostat part because this part says 92c (196 F) which is not what you quoted as normal operating temps.
S52s run 88C, non-M E36 sixes run 92C from factory.
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You are being handed information from M54s and M44s. Do not let them mislead you. Your car takes the 88C thermostat in your first link..Both the 4cyl and the later 6 cyl run hotter.
Incorrect for these cars. The system is closed loop at 14.7:1 as soon as the O2s come online and the airpump shuts off. Less than a minute typically.Running at colder temperatures is not good. Generally the fuel mixture is on the rich side (washing down the cylinders) and an engine can experience more wear due to excess fuel and cool engine components not being at operating temperature. Fuel mileage suffers and the catalytic converter is at risk by having too much fuel dumped in for too long of duration.
/.randy
I also would say faulty thermostat. Remember that the gauge shows 12 o'clock at around 70°C if I remember correctly, but the engine is not at full temperature before something above 90°C.
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