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BMW 318 BATTERY TROUBLE

  • 07-10-2009 5:55pm
    #1
    tattoo man
    Closed Accounts Posts: 174 ✭✭


    folks i bought a 2001 2 mths ago,there was a brand new battery fitted,after a week i pulled into me driveway at 2 pm one day,at 5 i tryed to start the car but battery was flat...there was nothing left on in car,so i put it down to new battery been faulty,i bought a new battery and now 2 mths on the car has gone dead again,went dead over night 2 times this week,i brought it to an auto electrican he said every thing was perfect and he cant find where the drain is coming from,and he couldnt sort the problem???ive also heard that in this model the air con can switch on over night and drain battery?????
    thanks in advance


Comments

  • #2
    Tails142
    Registered Users, Registered Users 2 Posts: 2,119 ✭✭✭Tails142


    On e39 5 series the final stage resistor or 'hedgehog' can go, and cause an intermittent drain through the heating fans running at a very low power.

    Not sure if its the same on 3 series.

    Google final stage resistor and you will see plenty of information, its an easy DIY to change them out.


  • #3
    brentaz
    Registered Users, Registered Users 2 Posts: 15 ✭brentaz


    email a chap called jonathan at atlas in drumcondra he is a qualified bmw guy on drumcondra@atlastyres.ie.

    he looks after my 5 series.


  • #4
    tattoo man
    Closed Accounts Posts: 174 ✭✭tattoo man


    Tails142 wrote: »
    On e39 5 series the final stage resistor or 'hedgehog' can go, and cause an intermittent drain through the heating fans running at a very low power.

    Not sure if its the same on 3 series.

    Google final stage resistor and you will see plenty of information, its an easy DIY to change them out.

    just as tails said above,i replaced this final stage resistor,the part cost i think 60 euro,got a lad to put it in,have had no trouble with battery going flat since,as above,when the resistor goes,the fans come on on there own,so over night the battery was drained,its a common fault in bmws,a fault that a garage will charge you an arm and leg to fix,cheers lads


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