a method for controlling the temperature of injection molding machines using cross - linking polymers and molding die units using plastics . each unit is equipped with at least one cooling channel for circulating a temperature controlling medium therethrough . the temperature of the exhausted medium is compared to a desired value and the circulation of the medium is adjusted accordingly . the method includes the steps of calculating the heat dissipation within a cycle and presetting the desired heat dissipation , prior to the start of temperature control . the temperature of the exhausted medium and the feed medium are continuously measured . the heat content value wrg of the unit is determined once the unit reaches thermal equilibrium . the value wrg is stored in a subsequent cycle as a desired value based on the difference between the temperature of the exhausted medium and the feed medium during a reference cycle . the desired value is compared with the instantaneous actual value measured during all subsequent cycles . a correction value is determined based on the deviation of the heat content from the reference cycle . the temperature control impulses trigger at point z 1 and terminate at z 2 at the latest . events z 1 and z 2 are preset signals from the unit sequence controller .