When idling it blows warm and cool air

Tiny
JLOCK11
  • MEMBER
  • 2000 LINCOLN NAVIGATOR
  • 5.4L
  • 165,000 MILES
My SUV blows warm air and cool air when idling. What is going on? Thanks, JL
Tuesday, December 26th, 2017 AT 4:05 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,294 POSTS
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
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Thursday, December 28th, 2017 AT 1:17 PM

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