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2015 CTD
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Discussion Starter #1 (Edited)
Anybody know what ambient air temperature or DEF fluid temperature causes the DEF heater to come on?

So let's say you live in a place that the coldest it might get is mid 40s. Like Miami or Phoenix.
Would it ever come on?
 

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My understanding is the heaters turn on at 40F or less. I think I read that on here somewhere.

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