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Check the cooling system, could be a blocked heater core or even a blown head gasket can potentially cause this, whichever the case you need to check your cooling system!
do you have smoke out the back esp from cold and still wen engine is warm?if no visable marks from core plugs or hoses then you may have a head gasget fault or it could be leaking out the heater matrix.check carpets for dampness or condensation.check to make sure all pipes and radiator are hot all over.water pump and thermostate not common faults on the 7 series.sounds like you might need to dig further.
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