inconsistent temperature issues

{"document":[{"e":"par","c":[{"e":"text","t":"i recently replaced the coolant reservoir and cap in my 2014 1.4L "}]},{"e":"par","c":[{"e":"text","t":"everything has been fine until a day or two ago. It does not normally overheat, even while idling"}]},{"e":"par","c":[{"e":"text","t":"however, my temperature gauge WILL creep up to the midline and sometimes a little further than the midline under heavy acceleration"}]},{"e":"par","c":[{"e":"text","t":"as far as i am aware, there are no further leaks in the system, and i have burped/bled the system several times, both through the bleeder screw and the traditional burping method"}]},{"e":"par","c":[{"e":"text","t":" (coolant cap open, start engine cold, rev with heater core fully open and squeeze coolant hoses intermedietlly)"}]},{"e":"par","c":[{"e":"text","t":"there is no check engine light indicating a failing thermostat or water pump, but im honestly not sure"}]},{"e":"par","c":[{"e":"text","t":"my evap purge valve needs to be replaced as my engine is running rich due to it"}]},{"e":"par","c":[{"e":"text","t":"the car has not TRULY overheated ever since i replaced but the warning signs make me weary of possibly warping a head over time "}]},{"e":"par","c":[{"e":"text","t":"thoughts? advice? comments? anything helps thanks"}]}]}