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jaugustavo 01-26-2010 04:55 PM

Question about battery voltage and coolant temp
Just want to make sure my 740 is running right. Currently my battery voltage is at 13.5v when running and my coolant fluctuates between 100c - 106c when it's fully warmed up. Are these numbers about par with everyone else..?



Beemaboy 01-26-2010 10:58 PM

My 1998 740I

Voltage tends to move from around 13.8 to 14.2 so I would say you voltage may be verging on being too low.
Mt temps go anywhere from 98C to 114C, so I think you are safe with those readings...

jaugustavo 01-27-2010 12:06 PM

So my voltage may be low on battery..but I just replaced that damn thing about two months ago. What could be an underlying problem with low battery voltage?

Beemaboy 01-28-2010 11:13 PM

It may not be the battery, but rather the alternator. If you are getting a low charge rate, it is either the diodes or the regulator that is on its way out (both part of the alternator)...

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