You’ll want to take the line starting with “M190” out of your gcode file. In Slic3r, under Filament settings > Filament > Temperature, change the values there to “0” to turn off setting temperatures in gcode. Set the temperature manually.
If you’d rather have the temperature set through Gcode, add the following PID tuning line to your Start Gcode:
M304 P162 I17 D378
You can PID tune your bed as well: https://www.lulzbot.com/support/fine-tune-your-marlin-pid-settings