Do you mix the gelatin in with cool liquid first and then heat it? (mommypotamus.com)
You mix it with a little water (or other cool liquid) and then pour it in the pan and stir. (marksdailyapple.com)
This is done by making sure that the cooling system (radiator, thermostat, water pump and coolant) has the proper amount of cooling liquid. (palmendodgechryslerjeepofracine.com)