2003 Mercury Mountaineer Heater not working

Tiny
L. GRIFFIN
  • 2003 MERCURY MOUNTAINEER

Heater problem
2003 Mercury Mountaineer 6 cyl Four Wheel Drive Automatic 105000 miles

When the heater is turned on, there is no heat blowing.

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Tuesday, November 3rd, 2009 AT 8:24 PM

20 Replies

Tiny
RICKMAR
  • MEMBER

You possibly have a "Blend Door Actuator" problem.

I hope I am wrong. It is a pretty expensive repair, not the part you need but the labor !

If it is the blend door actuator and you do not want to pay $1000.00+ for the repair ( I don't blame you at all) and you can do a little mechanical labor yourself there "is" a way to avoid all the dis-assembly which is involved by.
(Cutting a hole in your heater core box) to gain access to the blend door.
That is what I sure would do, without a doubt.
If you want to know how to do it just let me know and I will get the information of cutting that hole right to you.
Good Luck;
Rick

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Friday, November 13th, 2009 AT 9:55 PM
Tiny
RICKMAR
  • MEMBER

What is it doing, blowing just cold air?

If it is you could possibly have a blend door actuator problem.
The actuator is not moving the door in the direction it needs to go to receive the hot air from the heater core.
It is a very popular problem with Explorers and Mountaineers. I am surprised that through the years Ford/Lincoln/Mercury has not corrected the issue.
Rick

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Sunday, November 15th, 2009 AT 5:48 PM
Tiny
MDEVLIN
  • MEMBER

My 2003 Mountaineer is doing the same thing. Since we just got the truck out of the repair shop (yesterday) for rebuilding the tranny I really don't want to pay the $1000+ to repair. Merry Christmas to me! Could you send me the instructions on cutting that hole? And will this hole cause any other problems?

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Thursday, December 17th, 2009 AT 8:13 AM
Tiny
MDEVLIN
  • MEMBER

Found them on another thread.

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Thursday, December 17th, 2009 AT 8:15 AM
Tiny
RICKMAR
  • MEMBER

Yep... the whole dash needs to be removed, $1000+ mainly for labor.
It has been going on for 10+ years and Ford/Lincoln/Mercury has not improved the design ....the S.O.B.'s
Here is the link for the quick fix if you want to do it yourself:

http://www.2carpros.com/articles/mitchell1eautorepair-car-repair-manuals

There "is" another way and that is cutting a hole near the heater core and using duct tape to seal it back up after the repair is done. I will see if I can track that one down and post it here.

THE HOLE WILL NOT CAUSE ANY PROBLEMS AT ALL

Good Luck;
Rick

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Thursday, December 17th, 2009 AT 9:31 AM
Tiny
GEOGARDNER
  • MEMBER

Would please send instruction on cutting the hole in - to access heater blend door on my 2003 mountaineer.

George (geogardnerone@yahoo. Com)

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Saturday, January 7th, 2012 AT 12:27 AM
Tiny
JGAULIEN
  • MEMBER

Blows out same on all 4 speeds lil warm wont switch to defrost floor or vents

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Saturday, February 11th, 2017 AT 9:28 AM
Tiny
2CARPROS KEN
  • ADMIN
  • 5,425 POSTS

Hey JGAULIEN,

There is a blower motor speed controller that has probably gone out, here is a wiring diagram and guide so you can do some testing.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

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

Please run some tests and get back to us so we can continue helping you.

Best, Ken

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Wednesday, February 15th, 2017 AT 9:47 AM
Tiny
JAYCEE12345
  • 2003 MERCURY MOUNTAINEER
  • MERGED

Heater problem
2003 Mercury Mountaineer V8 All Wheel Drive Automatic 78000 miles

heat does not blow out only warm air what could be the problem

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Wednesday, February 15th, 2017 AT 9:48 AM
Tiny
BMRFIXIT
  • EXPERT
  • 19,526 POSTS
  • MERGED

As a 1st step you need to start with the thermostat
check it and check its operation
if in doubt replace it

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Wednesday, February 15th, 2017 AT 9:49 AM

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