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Replacing the Air Flow Blender on my 2010 Mercury Mariner

My blender is not working on my heater and the air flow will not change from floor to vents, to defrost, etc....

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Posted on Jan 02, 2017

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SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

  • 316 Answers

SOURCE: 2006 Merc GM, air flow out the defrost only problem.

sounds like a vacuum problem. Check vacuum lines. Maybe hooked up wrong.

Posted on Oct 04, 2009

Testimonial: "IT ended up being the actuator/flap in the HVAC system that directed the air. My entire dash had to come out to replace the $15 part... $700 worth of labor and 2 return visits to deal with missed electrical connection to my daylight sensor and a vacuum leak that caused it to stall when put into reverse."

  • 85 Answers

SOURCE: air conditioner and heater work only intemittently

bad vacuum line... with engine running open hood and listen for a hissing sound....check all vacuum hoses for cracks then replace them... also listen under the dash inside the car

Posted on Oct 13, 2009

Testimonial: "I do hear a slight hissing"

  • 5763 Answers

SOURCE: 2005 Mercury Grand Marquies

it sounds like a selector motor its a little motor screwed to heater box with an arm that moves the door to the desired location you select for air, you will have to locate then move all selector functions until find the one that doesnt move, then remove and move the arm in box to make sure thats the right one if it is right then the air will blow in diffrent locations, hope this helps, and yes you can do this, it not hard just takes time to find right motor.

Posted on Dec 19, 2009

  • 34 Answers

SOURCE: Blender door not working correctly on 2003 grand

not blend door, blend door is responsible for mixing hot air from heater core side with cold air from evaporator side of the system. you have a problem with your panel doors it may be an electrical problem with signals from you heater control module or a vacuum problem or you may have damaged components inside your dash. your vehicle will default to defrost setting automatically if there is a problem in the system

Posted on Apr 07, 2010

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Could be a blender door issue. What a blender door does is mix the cold air from the AC with the hot air from the heater core. If you put the switch ALL THE WAY to hot, the blender door (usually an actuator) pushes the door up and allows only air passing thru the heater core to enter the cabin. If you push all the way to cold, it only allows air from the AC. If you put halfway, it mixes/blends the air...

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The "blender" would refer to the blend actuators that change the flow of air from floor to vent to defrost or combinations. Properly working blend doors will allow you to direct air to the dash vents, the floor, the defroster, the floor and defroster or the floor and dash vents. If it is not working the heater will still work but you will hae no control oer where the air flows.

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I'm assuming the blower motor is working?if so,I'm also going to assume that all other vents are flowing?If so it may be the blender motor,or the actuall selector switch,if all other vents are flowing when you move the switch, I would replace the switch first,it is alot cheaper and easier than the blender motor.

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