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Yes there is a heater in the def tank. I had to change mine (ford) after it stopped working. It of course only works when the vehicle is running so a totally full tank will freeze solid at very cold temps. below 16F and split the tank. Also, a container of def will freeze and could split. If it is frozen it is unusable( won't pour) until it is thawed out. By the way, Ford has an extended warranty on that def heater and I was reimbursed by them a year later, when it was announced.
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