40-50K miles is early, i would say changing the ATF after 65K or between 70-100K miles,
Thirdy, the one i bought is without 4-zone climate control and the part#: 11517586925 and it will be for my SAV.

Yes, i agree, it seems like no room to work around for the e70. Did you remove cooling fan when you replaced waterpump/thermostat and belt?

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)