Quote:
Originally Posted by amrazem
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Towed it to the workshop and it was the alternator, common issue so I threw a new alternator and AGM bmw 105amhr battery in there for good measure.
After a day in the workshop she was back out driving as smooth as ever.. Took the chance to do a few other things, did a coolant service, brake flush, trans pan was leaking so I did the gasket with the pan and reused the old fluid and did the belts.
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Congrats! The car has all of the desirable options... Great find.
I assume you are a tech at a BMW dealer ... so you have access to the latest and greatest.
Questions:
1. Why did you put in a 105 Ah battery?
AFAIK, the pre-LCI e70's all used the 92Ah battery, even some of the early 2012 LCI's did. Did you also upgrade the alternator? If you did, did you code the car to accept a higher capacity alternator? If not, your standard alternator will never be able to charge the 105 Ah battery fully, correct?
2. You said you did a trans pan and gasket, but re-used the old fluid ... Why?
3. What about the coolant? Did you reuse that too, if not, why not?
Did you use the BMW machine that does an auto flush? My understanding is that machine effectively only replaces 4 quarts of coolant (and is mixed with ordinary tap water, not distilled water), leaving 4 quarts of "old" coolant behind to mix with the 4 new quarts ...
Keep posting. Love having the "inside scoop" from guys who actually work on these machines, especially at a dealer.