Hi Jez,
I had a similar experience back in the 60s, with a little Oldsmobile
F-85 aluminum V8. Finally figured out that it had a very small head
gasket leak, so that coolant was leaking into one of the cylinders.
There were no external signs of a leak anywhere.
Very frustrating!
Jim Nichols
Tullahoma, TN USA
On 7/16/2013 4:13 AM, Jez Cunningham wrote:
> Yup - I had the radiator expansion tank crack on my 5-series. Hard to
> diagnose too. Started overheating on vacation (during that VERY hot summer
> - 2003? when all the French grannies died of the heat) and took it into
> the local dealer near Verbier (Switzerland). They back-flushed the system,
> pressure-washed the radiator fins, checked the system pressure, checked all
> the belts, and found nothing. And that's also what they charged :-) Had
> to drive back from Switzerland to Belgium stopping at every service
> station. Traded it in with the fault still there (sorry).
> But otherwise it was ultra-reliable.
> Jez
>
>
> On 15 July 2013 23:19, Siddiq Siddiqui-Ali
> <muhammad.siddiqui-ali@xxxxxxx>wrote:
>
>> You've got the M54B30 motor, it's pretty bulletproof (had a slightly tuned
>> up one for 220k miles before selling my car, since wife was tired a 2hr
>> commute that used only first and 2nd gears (short geared 6). As long as
>> prior owner took good care of it, it shouldn't give you much trouble.
>> Smooth, linear power delivery, and pulls from idle till the fuel cut-off.
>> Known issues are the radiator expansion tanks (some crack around 100k and
>> leak). Take care of it, shouldn't leave you stranded--but that holds true
>> of most things. And yes, that interior is gorgeous, and even with age tight
>> like a drum.
>>
>> S
>>
>> On Jul 15, 2013, at 1:33 PM, Ken Norton <ken@xxxxxxxxxxx> wrote:
>>
>>> 2004 X5 E53 with 3 Litre in-line 6-cylinder engine. Automatic tranny.
>>> 225 hp @ 5900 rpm, 214 ft-lbs. @ 3500 rpm
>> --
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