If it were 5 degrees I would have the front cover on the truck. Maybe you do also need a flush out.
Next, do you plug it in at night, and how far do you drive. In weather that cold, I don't see heat until I have driven 4-5 miles.
Next, do you plug it in at night, and how far do you drive. In weather that cold, I don't see heat until I have driven 4-5 miles.