2002 E46 318SE touirng, air con and radiator cooling fan not working

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  1. 2002 E46 318SE touirng, air con and radiator cooling fan not working 
    #1
    Bimmer Fan
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    STEVEN_444's Car Details
    Model of Car:
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    Year of Manufacture:
    2002
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    Dear all.

    I think I have see a similar request for information and advice here this morning but can not find it for looking. so i appologise if i am repeating.

    The problem: Back at the end of the cold spell, I noticed that after a fastish run up from portsmouth to the severn bridge, while sat in the que to pass into Wales, my temp was creeping up, I used the heater control to bring it back from the red, also around the same time I became aware that the air con is no longer working. I have checked fuses, to no avail. The coolant level and temps are all good and normal once the car is moving, the coolant temp only gets up if the car is sat running in traffic for a while. I think I saw some thing relating both systems to an ECU this morning, but havent been able to find the post. Can one of you wiser peeps please point me in the right direction?

    New forum member looks forward to hearing from some one, wiser.

    all the best and thanks in advance.

    Steve.
    Last edited by STEVEN_444; 23-05-2011 at 20:25. Reason: Spelling
     
     

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    #2
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    Is the main fan turning? (the one between the engine and rad)

    The one in front of the rads you can see through the grill only runs when needed by the air con.

    Air con may need topping up with gas to get that working.
     
     

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    #3
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    STEVEN_444's Car Details
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    no it isn't, hence the overheat in traffic. My 318 isnt fitted with a pusher fan assembly.
     
     

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    It should turn even if slowly all the time, then as the engine gets hotter it throws the clutches out to make it spin faster.

    Have you checked the temp sensors on the engine and rad?
     
     

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    #5
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    not yet, but as the AC and Cooling Fan on the Rad stopped working about the same time, i'm wondering if there are any parts in common to both systems. As the temp Gauge in the car is apparently working ok, i dont think its a temp sender.
     
     

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    Have you checked the belts are ok and tight?
     
     

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    #7
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    the ac pump belt is fine, the fan is electricaly operated. thanks
     
     

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    The next step then is to check all the fuses and relays.
     
     

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    #9
    Dr of BMW gildersol's Avatar
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    E46:
    The electric fan is activated by means of a power output stage directly on the fan motor. The motor control unit activates this power output stage by means of a square-wave signal with duty factors (variable pulse width) between 10 and 90 % thus controlling the various speeds of the electric fan. Pulse duty factors less than 5 % and greater than 95 % do not trigger activation but rather they are used for fault detection purposes. The power output stage features its own positive and ground supply.

    The fan speed is influenced by the coolant temperature at the radiator outlet and the pressure in the air conditioning system. The fan speed is reduced as the vehicle speed increases.

    The electric fan is driven at maximum speed in the event of a fault in the coolant temperature sensor at the radiator outlet.

    Check the fuse first
    Last edited by gildersol; 27-05-2011 at 17:35.
     
     

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    #10
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    Gildesol, thanks for the information, the fuses are fine, is it at all likely that there should be a fan assy in front of my rad, the car was repaired after a moderated front ending over christmas whilst i was away on deployment, (in the navy)? i'll look at relays next? but should there be a fan assy there, if so next stop will be trainers bww swansea, and my insurers..........
     
     

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