Heater blows cold air

Tiny
JK3509
  • MEMBER
  • 1998 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
Heater blows cold air in front and rear. Hoses going to and from firewall are hot. Replaced thermostat. No change.
Thursday, December 6th, 2018 AT 12:23 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The odds of having two blend door motors fail at once are light getting struck by lightning.

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

The first thing I would do is to remove the hoses from the front and flush out the heater core. Use a garden hose to flush back and forth until all debris is gone and there is an even flow. If that does not work, good chance you will need a heater core.

https://www.2carpros.com/articles/replace-heater-core

Roy
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Thursday, December 6th, 2018 AT 4:25 AM

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