I've seen small leaks in the heater core, which isn't used during the summer so the stuff just sits there, cause a rotten smell that rivals shrimp/seafood left in the dumpster for a week. Check your coolant level, run your X with the heater on full heat at low fan speed for a while in your driveway, until it gets to full operating temperature and pressure for a while... then check if the ac drains that usually drip water when the ac is running are dripping any coolant. If by chance they are, you have a decent sized leak in the heater core.

This situation I described can cause a rather putrid smell, very strong. If it just smells like gym socks but not as strong as the dumpster behind the resteraunt it may be just the common mold/mildew that forms on the heater core/evaporator fins. In that case the spray bomb stuff in post#3 should work. Damn EPA regualtions doesn't allow the chemical coatings on the fins of the evaporator and heater core that stop this mold/mildew from forming anymore... which is why most modern vehicles have this problem but vehicles from a couple decades ago never do.

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X5 pics

RIP 4.6is.....

2003 4.6is