  We present sub-mm continuum and heterodyne data of the interacting galaxy NGC
3627, obtained with the HHT and APEX. We find significant changes in the
molecular line ratios over small scales in the southeastern part of this
galaxy. The kinematics of the CO(2-1) line, as well as the morphology in the
870um continuum emission, suggest a continuation of the western spiral arm on
the east side of the galaxy's central area. This continued spiral arm crosses
the normal eastern spiral arm in an area which shows an unusual magnetic field
configuration. This spiral arm crossing, independently of if it's physical or
just projected, may help in the understanding of the observed magnetic field
configuration.
