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

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

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.

4 Answers
55,870

TransAm77 answered 9 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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30,130

mikeatpriestlake answered 9 years ago

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

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55,870

TransAm77 answered 9 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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GuruCYFHB answered 5 years ago

BUY A NISMO RADIATOR CAP. SAME THING HAPPENED TO ME ON MY 2016 AND THE TECH TOLD ME ABOUT THIS. BECAUSE THE CORE IS HIGHER THAN THE ENGINE,IT MIGHT HAVE AN AIR BLOCK IN IT. THE NEW CAP WILL LET OFF STEAM UNLIKE THE OLD CAP AND WILL "BURP" THE SYSTEM.

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