We investigate the double-charm and hidden-charm hexaquarks as molecules in the framework of the one-boson-exchange potential model. The multichannel coupling and $S\ensuremath{-}D$ wave mixing are taken into account carefully. We adopt the complex scaling method to investigate the possible quasibound states, whose widths are from the three-body decay channel ${\mathrm{\ensuremath{\Lambda}}}_{c}{\mathrm{\ensuremath{\Lambda}}}_{c}\ensuremath{\pi}$ or ${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}\ensuremath{\pi}$. For the double-charm system of $I({J}^{P})=1({1}^{+})$, we obtain a quasibound state, whose width is 0.50 MeV if the binding energy is $\ensuremath{-}14.27\text{ }\text{ }\mathrm{MeV}$, and the $S$-wave ${\mathrm{\ensuremath{\Lambda}}}_{c}{\mathrm{\ensuremath{\Sigma}}}_{c}$ and ${\mathrm{\ensuremath{\Lambda}}}_{c}{\mathrm{\ensuremath{\Sigma}}}_{c}^{*}$ components give the dominant contributions. For the $1({0}^{+})$ double-charm hexaquark system, we do not find a pole. We find more poles in the hidden-charm hexaquark system. We obtain one pole as a quasibound state in the ${I}^{G}({J}^{PC})={1}^{+}({0}^{\ensuremath{-}\ensuremath{-}})$ system, which only has one channel $({\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{\mathrm{\ensuremath{\Sigma}}}}_{c}+{\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c})/\sqrt{2}$. Its width is 1.72 MeV with a binding energy of $\ensuremath{-}5.37\text{ }\text{ }\mathrm{MeV}$, but we do not find a pole for the scalar ${1}^{\ensuremath{-}}({0}^{\ensuremath{-}+})$ system. For the vector ${1}^{\ensuremath{-}}({1}^{\ensuremath{-}+})$ system, we find a quasibound state. Its energies, widths, and constituents are very similar to those of the $1({1}^{+})$ double-charm case. In the vector ${1}^{+}({1}^{\ensuremath{-}\ensuremath{-}})$ system, we get two poles---a quasibound state and a resonance. The quasibound state has a width of 0.38 MeV with a binding energy of $\ensuremath{-}16.79\text{ }\text{ }\mathrm{MeV}$. For the resonance, its width is 4.06 MeV with an energy of 60.78 MeV relative to the ${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{\mathrm{\ensuremath{\Sigma}}}}_{c}$ threshold, and its partial width from the two-body decay channel $({\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{\mathrm{\ensuremath{\Sigma}}}}_{c}\ensuremath{-}{\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c})/\sqrt{2}$ is apparently larger than the partial width from the three-body decay channel ${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}\ensuremath{\pi}$. In particular, the ${1}^{+}({0}^{\ensuremath{-}\ensuremath{-}})$ and ${1}^{\ensuremath{-}}({1}^{\ensuremath{-}+})$ hidden-charm hexaquark molecular states are very interesting. These isovector mesons have exotic ${J}^{PC}$ quantum numbers which are not accessible to the conventional $q\overline{q}$ mesons.