My 2008 Frontier won't heat/defrost cab when idling.

Asked by Sep 26, 2014 at 11:18 PM about the 2008 Nissan Frontier SE Crew Cab 4X4

Question type: Maintenance & Repair

When idling cab won't heat/defrost won't work.  Engine temp. rises as expected.  Cab/defrost begins working when you start driving.

3 Answers
23,230

answered 3 years ago

Could be a bad thermostat, dirty cabin filter, bad/plugged heater core or the electric cooling fan by the radiator isn't working.

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14,050

answered 3 years ago

sometimes the little doors that direct heat around are run by engine vacuum. check for vac leaks.

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23,230

answered 3 years ago

On something that new I'm gonna guess and say the blend door(s)are electronically controlled by small motors.

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