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Heater not working

Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 2003 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Just blowing cold air. I already drained and replaced coolant, flushed lines, blender actuator and temp control valve. Gauges are working and it doesn't overheat. Now what?
I am freezing please help.
Thursday, December 9th, 2021 AT 9:48 PM

13 Replies

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

I would start by flushing the heater core. Remove the two inlet hoses and use a garden hose to flush the core back and forth. You need a good even flow in both directions with no dirt or debris.

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

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

If that does not work, most likely the heater core is the issue and must be replaced

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

Roy
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Friday, December 10th, 2021 AT 2:34 AM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
Okay, I've checked and flushed coolant, thermostat, heater core, no coolant or water leaks, replaced control valve and blend door actuator, checked resistor switch and blower. No luck, still freezing. Oh and no sweet smells or overheating.
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Friday, December 17th, 2021 AT 10:12 PM
Tiny
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Okay did you do the voltage checks I asked you to do?

Roy
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Saturday, December 18th, 2021 AT 3:20 AM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
I have not, don't recall you saying anything about that. Voltage to what?
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Saturday, December 18th, 2021 AT 6:08 PM
Tiny
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Check for voltage to the blower motor with the key on to be sure there is power.

There should be voltage on both sides of the connector.

Roy
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Saturday, December 18th, 2021 AT 6:18 PM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
Oh, I will check that out of desperation, but the blower seems to be working fine.
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Saturday, December 18th, 2021 AT 6:23 PM
Tiny
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Is there good air volume to the cab?

Roy
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Saturday, December 18th, 2021 AT 6:24 PM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
Yes it is just cold not heat.
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Saturday, December 18th, 2021 AT 6:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The hoses to the heater core. How do they feel to the touch? Are they both hot?

Roy
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Saturday, December 18th, 2021 AT 6:28 PM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
Yes, I checked those too.
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Saturday, December 18th, 2021 AT 6:31 PM
Tiny
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How did they feel to the touch?

They should be hot. One hotter than the other.

Roy
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Sunday, December 19th, 2021 AT 5:20 AM
Tiny
FROZEN IN MICHIGAN
  • MEMBER
  • 7 POSTS
They are both hot. My brother wants me to change out the thermostat even though it isn't overheating and check fuses. What do you think?
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Sunday, December 19th, 2021 AT 6:22 AM
Tiny
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  • MECHANIC
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No, if the hoses are hot then it is not the thermostat.

It is coming down to the heater core itself.

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

I attached a YouTube video below for you to view. This is how I do the repair to save a bundle of time.

https://www.youtube.com/watch?v=Y4G6ljTEL9k

Roy
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Sunday, December 19th, 2021 AT 6:39 AM

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