Excess enthalpies H-E for binary mixtures of tricholorethylene and tetrachloroethylene with 2-alkoxyethanols at 298.15 K have been measured over the entire range of composition with Parr’s 1451 solution calorimeter. The alkoxyethanols were 2-methoxyethanol, 2 ethoxyethanol and 2-butoxyethanol. The H-E values are positive for the systems tetrachloroethylene + 2-alkoxyethanols, and a change in sign from negative to positive is observed for the systems trichloroethylene + 2-alkoxyethanols, The measured excess enthalpies decrease as the chain length of the alkoxyethanol increases.