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Thread: F25 takes forever to heat up (gauge) - Reader indicates Coolant temps hotter than oil

  1. #1
    Join Date
    Nov 2009
    Location
    North Carolina
    Posts
    24
    My Cars
    2002 530i

    F25 takes forever to heat up (gauge) - Reader indicates Coolant temps hotter than oil

    F25 temperature gauge takes 20+ minutes to move beyond the minimum 160 mark, and rarely gets to the 200 mark when driving. I understand that this is the oil temperature, not the coolant temperature.

    Checked engine values with the reader after idling for just a few minutes in 50 F weather. No codes for failed thermostat in the reader. Active temperature values in the reader were:

    Coolant temperature radiator value: 110 F
    Engine Oil temperature: 90F
    Coolant temperature engine: 122

    Driving the vehicle for a minute or so after idling, and there is warm air being pushed through the vents and cabin is warming up quickly.

    I make the assumption that the culprit is the engine oil temperature sensor and not the thermostat. Am I correct?

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    The coolant temps are way to low and the thermostat takes care of that, you could also use an infrared heat gun to read the radiator and hoses, I would be inclined to do that
    Last edited by jclausen; 03-21-2021 at 03:21 PM.

  3. #3
    Join Date
    Nov 2009
    Location
    North Carolina
    Posts
    24
    My Cars
    2002 530i
    jclausen, thank you for responding. I realize that I probably should have waited until the car was driven 5 minutes or so and the coolant temperature was up before providing values. That data was just from a few minutes at idle after a cold start.

    Based on the assumption that the oil temperature was very different from the coolant temperatures, and that the cabin air was producing warm air when requested (even though the oil temp on the gauge was still bottomed out at 160), that the oil temperature sensor was the culprit in my scenario and should be replaced.

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