The dynamic behaviour of the electron temperature profile was studied in different phases of the TEXTOR Tokamak discharge. The Te profile evolution was observed during start-up, flat-top and current ramp-down phase. Detailed measurements during sawtooth activity and density limit disruption were obtained. The heat diffusivity chi e was evaluated from heat pulse propagation data. The energy and current quench times were recorded in a density limit disruption after a preceding Te profile contraction.