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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > How to determine thermostat condition using ISTA-D?



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      01-18-2022, 11:57 AM   #1
NiBe
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How to determine thermostat condition using ISTA-D?

Hi,

ISTA-D shows me:

1) coolant temperature at engine side
2) coolant temperature at radiator outlet

They are typically different. In my case 2) is 5-10 degrees of Celsius lower than 1) all the time

How can I use this info to determine thermostat condition? What should I see on cold start? How different 1) and 2) should be? Let's say that surrounding temperature is 5 degrees of Celsius and let's suppose a cold start. What should happen within 10 minutes after the cold start?

Thank you.
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      01-18-2022, 03:52 PM   #2
NiBe
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Using this: https://bimmerprofs.com/thermal-mana...eries-engines/

I was able to test my thermostat and confirm that it is working fine.
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