Our new 21-arcsec resolution CO J = 2 --> 1 map of the L43 dark cloud
shows a poorly collimated molecular outflow, with little evidence for
wings at velocities greater than or similar to 10 km s(-1). The outflo
w appears not to be currently driven by a jet: its structure can inste
ad be modelled as a slowly expanding shell. The shell may be compresse
d either by a wide-angled wind catching up with an existing shell las
in the case of planetary nebulae), or by the thermal pressure of a hot
low-emissivity medium interior to the shell. The outflow is most prob
ably in a late stage of evolution, and appears to be in the process of
blowing away its molecular cloud. We also present a 45-arcsec resolut
ion CO J = 1 --> 0 map of the whole molecular cloud, showing that the
outflow structure is clearly visible even in the integrated intensity
of this low excitation line, and suggesting that rapid mapping may pro
ve useful as a way of finding regions of outflow activity. We also exa
mine the immediate surroundings of the driving source with 450 mu m im
aging: this confirms that the outflow has already evacuated a bay in t
he vicinity of the young stellar object.