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Heat works but then stops after a minute

Tiny
TYLER YOUNG
  • MEMBER
  • 2003 FORD ESCAPE
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 201,000 MILES
Alright, when my vehicle is at operating temperature and I turn on the heat it will blow heat then get cool after about a minute. Both heater core hoses under the hood are warm, lower is warmer than upper. I pulled out the blend door and got no change, the thermostat is in working order, cooling system is bled. I am out of ideas. If I keep turning the blower motor off after it gets cool and back on, it blows heat again and then gets cool again and so on.
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Friday, December 23rd, 2016 AT 6:14 PM

7 Replies

Tiny
JOHNNY G.JR
  • MECHANIC
  • 320 POSTS
It is quite possible heater core is clogged. Pull heater hoses off of engine side, leave them attached to heater core and reverse flush in the opposite direction of normal flow.
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Friday, December 23rd, 2016 AT 6:29 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,445 POSTS
Sounds like a partly blocked heater core. Clamp off the heater hoses, pull them off and flush the core and see if it helps.
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Friday, December 23rd, 2016 AT 6:29 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Maybe see if my link is the deal?

https://www.2carpros.com/questions/heat-74357129

Return here with good news!

The Medic
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Friday, December 23rd, 2016 AT 6:31 PM
Tiny
TYLER YOUNG
  • MEMBER
  • 3 POSTS
So can I pull the two hoses off under the hood, flush the proper chemicals through the upper or lower (?) Tube to flush the heater core?
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Friday, December 23rd, 2016 AT 6:31 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Just see my link?

No need for chemicals!

The Medic
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Friday, December 23rd, 2016 AT 6:34 PM
Tiny
TYLER YOUNG
  • MEMBER
  • 3 POSTS
I read it, going to give it a try tomorrow. Thanks! Hopefully this works!
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Friday, December 23rd, 2016 AT 6:35 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Sorry other experts took me a while to find my link, I am just not quick on the draw!

You would be surprised how many people take that problem to a shop when they could fix it up in thirty minutes in the driveway.

For Sure.

Return here with some good news!

The Medic
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Friday, December 23rd, 2016 AT 6:47 PM

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