E92 - When to replace water pump, thermostat, hoses, sending unit, etc?

I haven't been able to find a recommendation on performing a preventative cooling system overhaul on the 2007 328i (mine's a coupe). By overhaul I'm considering the water pump, thermostat, level sending unit, overflow tank, hoses and belts.

Is there a consensus on when this should done? Any other parts you would recommend replacing?

Originally Posted by dgallant

I haven't been able to find a recommendation on performing a preventative cooling system overhaul on the 2007 328i (mine's a coupe). By overhaul I'm considering the water pump, thermostat, level sending unit, overflow tank, hoses and belts.

Is there a consensus on when this should done? Any other parts you would recommend replacing?

There isn't a consensus AFAIK. The pump and thermostat are far different than on previous motors (M54 etc.) The pump is electrical rather than belt driven, and is far more expensive ($500 or so for the part, $100 for the 'stat). I've seen a couple stories about the pump failing - but unlike on previous models, the ECU shuts down the engine (first reduced power) and makes you park it. This seems to be preventing loss of engine.

Replacing the radiator, expansion tank and hoses at 100K - at least they're inexpensive.
Note that, since the belt doesn't drive the pump, your battery will keep it running so that's not a critical issue.

Originally Posted by dgallant

I haven't been able to find a recommendation on performing a preventative cooling system overhaul on the 2007 328i (mine's a coupe). By overhaul I'm considering the water pump, thermostat, level sending unit, overflow tank, hoses and belts.

Is there a consensus on when this should done? Any other parts you would recommend replacing?

No PM schedule for all but maybe hoses & belts.

None the less, to attract really good energy, repeat this monotone mantra until enlightenment is achieved:

"If it ain't broke don't fix it"

Originally Posted by CALWATERBOY

No PM schedule for all but maybe hoses & belts.

None the less, to attract really good energy, repeat this monotone mantra until enlightenment is achieved:

"If it ain't broke don't fix it"

Bull how about "F&ck I should have overhauled the cooling system before it broke"

If you want to practice aircraft maintenance.

Get the Mike Miller maintenance schedule and rebuild the cooling system according
to his schedule . Google Mike Miller BMW

Originally Posted by Bemo

Bull how about "F&ck I should have overhauled the cooling system before it broke"

The mantra of hard Sadhana.

Mr. Miller sez:

It actually pains me to recommend replacing the entire cooling system preventively
before 100,000 miles, as above. Yet experience has shown this maintenance is cheap
compared to the alternative. It is unbelievable how many engines are destroyed in these
cars by premature cooling system failures.

BUT goes on to say:

The N-series engines do not seem to suffer the sort of regular and systematic cooling
system failures that led me to recommend replacing the entire system on the above
engines as a preventive measure. If your BMW is a 2006 or newer and not an E46, then
you've got an N-series engine.

OK.....who gets this witty joke?


.

If it was a 2006 325i or 330i or a 335i I would suggest you to do it at 80K miles. There is a trend

But given the very rare occurrences on the N52N (redone in part 2007+), I would pass (I am in the same boat).

Thanks for the feedback. It is making me feel better about my 2007 328i (coupe). I'm at 68K miles. This and Mike Miller's stuff has me feeling better about my cooling system.
I had overhauled the cooling system in my last bimmer, an E46 - 2000 323ci, which I know was a good move. I wasn't looking forward to doing it again to be honest.

Originally Posted by ctuna

If you want to practice aircraft maintenance.

Get the Mike Miller maintenance schedule and rebuild the cooling system according
to his schedule . Google Mike Miller BMW

ahh, I was just searching for this myself the other night.