Defrost works without A/C.
Defrosting occurs even without having defrost on as engine heat is wafted through the vents on the outside, but when I press DEF blazing hot air blasts from the top vents like a furnace.
When the temp is really cold, the regular heater also blows up top.
Though now, when I press DEF, the furnace is accompanied by a troubling click click click.
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