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Thread: Running very hot in the summertime only

  1. #1
    Join Date
    Apr 2019
    Location
    omaha
    Posts
    5
    My Cars
    2007 328xi

    Running very hot in the summertime only

    I have noticed for the last 2 summers that the car is running hot during the summertime. I live in southern Nebraska, so our summers can be hot 90-100. These temperatures should not be an issue but it is. If i turn the AC, then I overheats without fail. During the rest of the year I have no problems. FYI the water pump was replaced almost 2 years ago. As summer is approaching im looking to run thru the following to get in forth of this problem:

    1. Coolant bleed & flush
    2. Replace the radiator cap

    These are a couple of things that seem easy to start with. What do you guys think?

    bmw 328xi, 250k mileage, 2007 coupe

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    If I'm not mistaken you don't have a coolant gauge but you do have a oil temperature gauage that would read rather hot if you thought it was the coolant temperature gauge

  3. #3
    Join Date
    Feb 2015
    Location
    Irmo, SC
    Posts
    84
    My Cars
    328Ci, 335i, 330Cic
    Agree w jclausen. My 07 335i has oil temp and not coolant indication. Commonly missed. And the normal temp band is not dead center in some cases..

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  4. #4
    Join Date
    Apr 2019
    Location
    omaha
    Posts
    5
    My Cars
    2007 328xi
    thanks yes thats correct, My understanding is that should not be reading 300 and that 250ish should be the normal.

  5. #5
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    The oil temp will vary, there maybe is an after market oil cooler set up available if you wanted to have better oil cooling. The old BMWs came with big long oil coolers like on e30's, e28's etc I don't know why they wimped out on these newer cars.

  6. #6
    Join Date
    Sep 2006
    Location
    Michigan
    Posts
    13,674
    My Cars
    2005 325Xi
    300 is too high, but you shouldn't be getting up into those temps unless you're driving uphill for extended periods. Are you getting any overtemp warnings? Any other problems related to overheating?
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  7. #7
    Join Date
    Apr 2019
    Location
    omaha
    Posts
    5
    My Cars
    2007 328xi
    Update: I was able to figure it out. I was using 0w-40 oil year round. When I changed it to 5w-40...oil temp dropped to normal thanks

  8. #8
    Join Date
    May 2017
    Location
    Ontario, Canada
    Posts
    512
    My Cars
    335i E93 N54
    Quote Originally Posted by plvasco View Post
    Update: I was able to figure it out. I was using 0w-40 oil year round. When I changed it to 5w-40...oil temp dropped to normal thanks

    Fascinating that it had such an impact.

    You should consider a JB4 if the issue returns. It would let you monitor and record all DME parameters to your phone over bluetooth. I love mine for monitoring and troubleshooting. You can see the oil and water temp dance, as different driving conditions adjust the temperature for optimum performance or efficiency, which are at different temperatures.

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