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    #1

    Overheating Continued

    Hey all! Having overheating issues. It all began when my heater core went out. I have since disconnected and plugged the hoses to the core (can't really afford a new one at the moment). These overheating issues never were before the heater core busted. I checked and cleaned the radiator, it seems fine. I have recently replaced the thermostat.

    Could there possibly be some kind of blockage in the engine itself?

    What are some tips you all can give about flushing my car's system?

    Help me out r3v!
    "...And so he drove on, the rain clouds dragged down the sky after him, for though he did not know it, Rob McKenna was a Rain God. All he knew that his working days were miserable and he had a succession of lousy holidays. All the clouds knew was that they loved him and wanted to be near him, to cherish him and to water him."
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    #2
    The overheats might have damaged something. What the oil and coolant quality look like?

    Do the over heats get better or worse when you drive? If your fan is a problem the car will only overheat when sitting still.

    All radiator hoses getting hot, indicating fluid is moving?

    Thermostat has to function for cooling system to work. Did you have an overheat problem before you replaced the tstat?
    www.Gress.org

    All that is necessary for the triumph of evil, is for good men to do nothing. -E. Burke

    NASA SpecE30 #6, BMWCCA #161
    sigpic

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      #3
      Did you actually plug up each of the heater core hoses at the firewall or did you connect/join them together? I may be very wrong, but I 'think' they will need to be joined together to enable the coolant to still flow properly.
      Eric Giles
      '20 M2 CS
      '04 M3
      '11 X5 35D
      '87 325is
      '91 325i Sport

      There are few things more expensive than a cheap BMW...

      Comment

        #4
        @RangerGress: The car definitely gets worse as I drive. I replaced the thermostat about 6 months ago but I really didn't drive the car much before that as I bought it used and the thermostat was one of the first things I replaced.

        @Eric Giles: I did have them looped but was told that it was better to have them plugged. It seemed to help a little to have them plugged.
        "...And so he drove on, the rain clouds dragged down the sky after him, for though he did not know it, Rob McKenna was a Rain God. All he knew that his working days were miserable and he had a succession of lousy holidays. All the clouds knew was that they loved him and wanted to be near him, to cherish him and to water him."

        Comment

          #5
          Is thermostat possibly stuck closed? And have you bled the system properly after cleaning rad, and playing with the hoses?
          sigpic
          Parts Wanted
          The Never-ending Resto Mod

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            #6
            UPDATE:

            So, I've checked the radiator, replaced the water pump and thermostat, did a thorough flush of the coolant system and there are no leaks in the system but my car is still running warm. Not quite in the redline, but the auxiliary fan switches on to the low setting after not so strenuous driving.

            I'm curious if the fact that I have plugged the hoses to the heater core (the core went out on me recently) would cause it to run warm.

            Ideas?
            "...And so he drove on, the rain clouds dragged down the sky after him, for though he did not know it, Rob McKenna was a Rain God. All he knew that his working days were miserable and he had a succession of lousy holidays. All the clouds knew was that they loved him and wanted to be near him, to cherish him and to water him."

            Comment

              #7
              I had the similar thing happen a few years ago and replaced everything except the radiator with no luck. I thought the radiator was good because I could flow the garden hose through it without resistance. After a new one the overheating went away. It happened in the beginning of summer too. I think the radiator had only a couple channels open for water flow and wasn't cooling the car well enough. What did you do to check the radiator? Was you heater core plugged? If so then your rad is most likely similar.

              Comment

                #8
                Originally posted by rdbussman View Post
                UPDATE:

                So, I've checked the radiator, replaced the water pump and thermostat, did a thorough flush of the coolant system and there are no leaks in the system but my car is still running warm. Not quite in the redline, but the auxiliary fan switches on to the low setting after not so strenuous driving.

                I'm curious if the fact that I have plugged the hoses to the heater core (the core went out on me recently) would cause it to run warm.
                Plugged heater hoses won't cause the engine to run hot, looped hoses may. I don't know how you determined that the radiator is okay, but the only way I know of is to remove the grill, aux fan, and A/C condenser and look at the radiator with an IR camera. If the radiator is original, replace it with a new unit.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

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                  #9
                  my gf's 325i is suffering from same symptoms... even busted upper rad hose.

                  Comment

                    #10
                    Yeah, I only ran the garden hose through the radiator and cleared out any gunk. Looks like to really eliminate problems, I've got to replace the radiator. Putting up want ad now.
                    "...And so he drove on, the rain clouds dragged down the sky after him, for though he did not know it, Rob McKenna was a Rain God. All he knew that his working days were miserable and he had a succession of lousy holidays. All the clouds knew was that they loved him and wanted to be near him, to cherish him and to water him."

                    Comment

                      #11
                      Don't waste your money and effort on a used radiator. It could have worse problems that the one you have. A new radiator will cost between $200 and $270, depending on what car you have.
                      The car makes it possible, but the driver makes it happen.
                      Jim Levie, Huntsville, AL

                      Comment

                        #12
                        So I replaced the radiator and now all overheating symptoms are gone! Back to normal running for me!

                        Also, I took apart the old radiator to see its condition and this is what I found:
                        "...And so he drove on, the rain clouds dragged down the sky after him, for though he did not know it, Rob McKenna was a Rain God. All he knew that his working days were miserable and he had a succession of lousy holidays. All the clouds knew was that they loved him and wanted to be near him, to cherish him and to water him."

                        Comment

                          #13
                          damn, that def looks like it could cause some over heating. Probably worth getting a new one myself. I have a slight over heating problem but only at idle and mostly when its really hot out as it has been here lately.

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