I have an E39 528iT. It is an American market car with the dual zone
HVAC controls. When I start it with the A/C on (hot humid climate) the
blower will run porperly for about 2-3 minutes, and then suddenly stop
for 2-3 minutes. It will continue this cycle ad infinitum. The A/C coil
is still cold, you can drive the car with the back windows cracked down
at speed, and the vent system will draw in chilled air from the outside
through the chiller coil. The problem is totally independent of any
setting in the HVAC control head. Anybody got an idea?