Question about 2003 BMW 5 Series

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How do I replace the temperature thermostat on 2003 BMW 525i?

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  • jcram1972 Jul 09, 2010

    How do I replace the temp thermo on 2003 BMW 525i? The problem is the ratiator is in the way...

  • jcram1972 Jul 09, 2010

    How do I replace the radiator fan on 2003 BMW 525i? The problem is the fan cowl is in the way and the ratiator will not come out?

  • jcram1972 Jul 09, 2010

    YOU ARE THE MAN..."GURU!!!"

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The procedure to remove thermostat is as follows:---
You will require proper tools to remove parts to reach the thermostat.
1)You will need a 32mm wrench a 10mm 11mm 13mm socket and a flat head screw driver.
2) Now with the help of 32mm wrench take fan blade off by turning clock wise.
3) Once fan is out off the way  then you can use the screw driver to remove the clips on the upper & lower radiator hoes.
4) The thermostat is held on with 3 10mm bolts take them off and 1 13mm bolt. When you remove the 13mm bolt you will also need to loosing the 11mm nut that holds the engine pull bracket.
This will help.

Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 09, 2010

  • jcram1972 Jul 09, 2010

    Dang it...! You said~ With a 32mm wrench take fan blade off by turning clock wise. Do I have to hold the blade in order for it not to spin...? If that's it...YOU ARE THE MAN!!!!

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Usually thermostat refers to the following: Thermostat Removal & Installation To Remove:
NOTE: Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.

  1. Before servicing the vehicle refer to the precautions at the beginning of this section
  2. Remove or disconnect the following:
    • Fan clutch with fan impeller and fan cowl
    • Engine coolant
      NOTE: The water drain plug is located on the exhaust side of the engine block by cylinder No. 2.
  3. Replace sealing ring of water drain plug
  4. Vent cooling system and check for leaks
    • Hose locks and disconnect water hoses
    • Loosen nut
    • Bolts on thermostat housing then remove thermostat housing
  5. Keep sealing faces clean and free of oil
To Install:
  1. Install or connect the following:
    • Drain plug with new sealing ring
    • Thermostat (w/ integral thermostat) housing
    • Install bolts
    • Connect water hoses and engage locks
    • Tighten nut
    • Fan clutch with fan impeller and fan cowl
    • Engine coolant
  2. Start the engine then idle until normal operating temperature is attained
  3. Recheck coolant level and top off as needed
----
However, if the thermostat you're talking about is for climate control, that is another issue.

Posted on Jul 09, 2010

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  • jcram1972 Jul 09, 2010

    The problem is the fan cowl is in the way and the ratiator will not come out?

  • Duane Wong
    Duane Wong Jul 09, 2010

    The fan cowl should come out with bolts to the frame, I believe.

  • Duane Wong
    Duane Wong Jul 09, 2010

    This is definitely a problem, because if you don't know where all the bolts are,

    then that cowl is not coming out any time soon, which sinks your plans of proceeding.



    Maybe, if you can't do it yourself, get a technician to do it for you. Probably won't charge too much.

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  • Master
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Hi,

Remove the fan clutch and fan and cowling.
Drain the radiator system of all coolant.

Pull locks and disconnect waterhose's from front of engine.
Loosen the 3 bolts holding the thermostat housing.
This should get the housing and the thermostat off in one unit....please note that this is just one whole unit and can not be separated, so you have to purchase as one unit also.

Hope this helps,let me know if you need more information

Thanks

Jason

Posted on Jul 09, 2010

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Posted on Dec 25, 2009

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SOURCE: 1995 BMW 525I over heating issue. I repaired head

Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Posted on Aug 26, 2010

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