When idling it blows warm and cool air

2000 LINCOLN NAVIGATOR
165,000 MILES • 5.4L
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JLOCK11
  • MEMBER
  • 1 POST
My SUV blows warm air and cool air when idling. what is going on? thanks, JL
Dec 26, 2017 at 4:05 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
Hello,

It sounds like the engine coolant level is slightly low causing the heater core to run out of coolant when at idle.

Here is a video to help you check the coolant level.

https://youtu.be/GSE9skKnOgY

Here is a guide hat can help as well.

https://www.2carpros.com/articles/car-heater-not-working

Please let us know what happens.

Cheers, Ken
Dec 28, 2017 at 1:17 PM
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