Why is my car's heat blower not working when it's really cold out ? It works above 15 but not when it's below ( +/- ). Thermostat setting?

Sometimes it will take an hour for it to kick in.

2007 Infiniti FX35

Other answer:

If the coolanr was ever changed with out using a vacuum fill tool such as an "Airlift" brand there is an air pocket in the heater core. You can't get the air pocket out of Nissan's or Infiniti's with a vacuum fill tool.
Blower motor getting worn out maybe…
Lou C. Ferr:
You need to check your antifreeze ratio. It should be 50/50.
redd headd:
you need a new thermostat

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