[boraz]

Def shouldn't freeze no matter how cold is, it's the heater who's not doing the job.

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umm, itll freeze every time you park if its cold enough

the def heater will thaw it for use.

 

[boraz]

The EPA (which is what your cruze is made to) allows some grace with frozen DEF. As long as the heater is working (hah!) it should be fine.

Also in my experience if the def is frozen it will jump to around 33% or so,

it needs to be thawed in 70 mins as per the EPA

 

[boraz]

And it takes what, 5000 BTU to thaw a full tank?
Does that mean the heater is around 1.5kw?

Or does it just have to thaw the area around the pump and start flowing reliably in 70 minutes?

dont know how many btus

cant see why it would need to thaw the whole tank, the car barely uses any def and it just needs to be warmer than ~12f to be thawed, so it shouldnt be sooo energy intensive

one could go look at the fuse panel and find the def tank circuit at fuse amps and do the math