A/C problem, blowing hot air

Tiny
HIGGY909
  • MEMBER
  • 2006 MERCURY MARQUIS
  • 2WD
  • AUTOMATIC
I have a 2006 Grand Marquis and the heat a/C system blows out only hot air. I do not know if the blend door (pass side behind glove box) is working. A/C unit working, the lines are cold, everything appears normal. Any suggestions?
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Friday, April 29th, 2011 AT 3:06 PM

14 Replies

Tiny
WRENCHTECH
  • EXPERT
The blend door actuators go out all the time and is sounds like the temperature actuator is not working. Here is a guide to help you see what you are in for when doing the job and diagrams below to tell you the location and how to replace it on your car:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are the temperature blend door location and the HVAC system wiring diagrams so you can see how the systems works. Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Friday, April 29th, 2011 AT 3:26 PM
Tiny
STEVE-BIGGS
  • MEMBER
Thanks for this post it helped me fix my car. The part cost me $76.00 and all set. A little tough to get at but I made it happen. :) I love this site.
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Thursday, September 6th, 2018 AT 3:30 PM
Tiny
NIKITABOYLAND
  • MEMBER
  • 2006 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
What causes hot air to blow from defrost vents instead of the correct vents. The compressor has been checked and the clutch is engaging properly and the Freon level is fine.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
NIKITABOYLAND
  • MEMBER
The air conditioner is not blowing with same force as it sounds and the automatic temperature climate control never changes or shuts off. I heard that it could be possibly be an expansion valve block issue behind the dashboard. Please respond with possible answer.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
RAARGROUP
  • MEMBER
  • 2006 MERCURY MARQUIS
  • 42,000 MILES
AC was blowing warm air and I went to get Freon added. Dealer told me the AC Freon was fine, but he reprogrammed AC. Now, changed out old battery and AC is blowing warm air again. How do I reprogram?
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
You drive it back to the dealer and tell them what happened. That is what I would do.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
RAARGROUP
  • MEMBER
I thank you for the reply, but they did it through the dashboard with the regular instrument panel.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
It has a self test and a self calibrating feature but you cannot program anything that way.

Electronic Automatic Temperature Control Module Self-Test:

The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns.
The EATC module self-test will detect concerns in the system control functions and will display hard DTCs in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4 -32 C (40-90 F) when carrying out the self-test. If the temperatures are not within the specified ranges, false in-vehicle temperature sensor DTCs will be displayed.
The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within 2 seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation. See: Symptom Related Diagnostic Procedures
To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
Always exit the self-test before powering the system down (system turned OFF).
Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
EILLIW
  • MEMBER
  • 2004 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 53,000 MILES
I am not getting any cool air through my AC vents just on top of the dash where my defroster air comes from. How do I manually switch it to make the air to come out of my AC vents?
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
I think you are dealing with a vacuum leak in situation. The vents are actuated by vacuum. If there is a leak, what you described is what happens.

Check under the dash for disconnected, damaged, dry rotted, vacuum hoses as well as under the hood. If you are lucky, you will hear a hissing sound from the leak with the engine running.

Let me know what you find.
Joe
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
LAWRENCPAUL
  • MEMBER
  • 2005 MERCURY MARQUIS
  • 125,000 MILES
Turn heat on heat blows out cool air. Defroster blows cool air. No blown fuses. Started car remove cap from radiator turn heat on high let car run to see if heater warms. Heater does not warm and car does not overheat.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
With the engine at full operating temperature, locate the two heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2007 MERCURY MARQUIS
  • 75,702 MILES
At idle, AC compressor disengages and blows hot air. At highway speeds air blows cold from thirty mph upward. Is there a low idle speed sensor for the compressor?
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Have Freon charge checked.
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Thursday, September 6th, 2018 AT 3:30 PM (Merged)

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