Why bmw x5 battery drain fan not working exhaust blowing out white smoke... what may be happening.

Most of the time blown or Cracked head means coolant in the oil

Maybe you have got it clogged. I think you should go to service

check your anarobic switch

White smoke means a coolant leak, check it and repair before to overheating your engine.

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head gasket

check the emission system on ur bmw once and then if it doesn't help get a new one.

Has the car overheated recently or in the past? If you are seeing white smoke from the exhuast you may have a cracked cylinder head or blown head gasket. If you are seeing white smoke from the exhaust, check the oil for signs of coolant (milky brown oil color or any foamy white on the dipstick) Also check you coolant level to see if it is lower than normal. If the smoke you are seeing is black you should also check you oil level. (could be a burned valve).

the ERG valve has packed up,just pull the vacumn operating pipe off that comes from the valve on the side and goes to teh ERG valve and it will work fine without it ,trust me

hi get your egr valve removed and cleaned could be sticking open this would cause loss of power and smoke.

Just had my car in the garage with horrendous white smoke coming from the exhaust. The problem with mine was a blocked crankcase breather. When blocked oil is passed into the exhaust system apparently.
Problem solved by the mechanic and half a day in the garage with the engine running to burn off the excess oil in the exhaust and the problem was solved. Had gentle ride out to the coast yesterday approx 1.5 hrs each way and the smoke has gone.
Good result for £160.00. I dread to think what the dealer would have charged.