<E36 M50> Changine Spark Plug and flush Coolant

["Peter_Li" <peter_li@xxxxxxx>]

>How should I change the coolant?  If I unscrew the little screw at
>the bottom, the coolant will come out, but not all of them though.  and, 
>I know I suppose to keep 50/50 mixture, but, I can't drain the whole 
>cooling system (or I don't think that is possible.)  any hints or 
>advice?
     
Perry,
     
    There are two screws that you'll need to unscrew in order to fully 
drain the coolant.  One at the bottom of the radiator on the driver side 
and the other one is at the bottom of the engine block, on the passenger 
side.   Make sure you let the engine completely cool down before you 
attempt to drain the coolant.   On filling up, open up the air escape 
hatch on the top of the radiator right next to where you are going to 
pour down the new coolant/distilled water.  Do it slowly and try to let 
all the air bubbles come out thru the escape hole.   It takes about an 
hour.
     
     
Best Regards,
     
Peter Li
NJ BMWCCA
'95 325is

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