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Master Class Auto
Master Class Auto, ASE - Master Auto Technician
Category: Car
Satisfied Customers: 253
Experience:  20+ years, full time experience. Specialize in Diagnostics & Electrical
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location of the darn blend door and how do you get to it?

This answer was rated:

Where is the location of the darn blend door and how do you get to it?
Hi Shade Tree,

This question is "vehicle specific". Can you please post your exact year, make and model? Thank you!

Best,
Master Class
Customer: replied 8 years ago.

19943 Licoln Town car --Signature series 4.6 liter engine- have replaced two componentas--one that controls blower speerd under the hood--one ATC control in dash. You guys said the blend door isn't working; bwhat controls that, and where is the door located in the car?

 

Customer: replied 8 years ago.
I haven't received any reply. Hasve you gone for lunch?

Hi Shade Tree,

 

I understand. Sorry for slight delay. OK, one last thing.

 

1) You made it sound like this question was already submitted to JA before. If so, was/is any other Experts involved currently? Was an older question closed and this one is new - but yet same problem area?

 

2) Also, please tell me your vehicle symptom or symptoms. If you replaced all those parts, you're obviously trying to repair 'something'. Do you have 'no heat' or a problem regulating temperature? Or, have you a problem controlling WHERE the air goes? Ex. Floor, vent, defrost and so on. Please let me know before I continue.

 

Best,

Master Class

Customer: replied 8 years ago.
I have no heat Cold air vents work fine. both heater hoses are hot. Door to let b,lower run hot air into car will not open. floor, vent , anbd defrost cont5rols direct airt wherre they should. Just no air blowing through hort heater core.

Hi Shade Tree,

 

OK I understand. You actually have no hot air getting to where it needs to go.

 

If both heater core hoses are hot - you have a control issue.

 

You likely have a seized blend/temp door actuator. Common on Ford/Lincoln/Mercury vehicles since the 90's up. I have replaced many over the years in the Taurus, Sable, Lincoln and so on.

 

Some Theory: That actuator should react to auto and manual temp inputs from control panel. Problem is, you basically have to remove the entire dashboard to gain access. However, I usually take the dash 'mostly' out. ( I lift it up just enough and support it while I work under it to R&R actuator) Problem is, once you get dash to the point of being able to partially remove, tilt and lift it - the time you save is minimal.

 

You see - in your vehicle the HVAC/Heater box is mounted so close to the bottom of dash - that you cannot physically get in there to remove the screws and release the actuator.

 

One Helpful Hint: I also think it's worth putting the Auto Climate Control unit into diag mode. Many times you can get codes which helps make sure you're going in the right direction. Let's say an HVAC Temp Sensor error code was stored - and no other. I'd replace that first, clear codes and retest before condemning the Actuator. But yes, they do fail a lot. I'm including photos.

 

If you accept I will work with you further as needed.

 

Blend Door Location:

Top (near center) of heater box, under dash, between top of heater box and underside of dash. Pics included. **NOTE** The image that shows two blend door actuators side by side, be it known, the white one is for a MANUAL system and the BLACK is for ATC. Look close at labels. Images are for reference only and actual production part and/or replacement part appearance may vary. Lastly, the image that shows the top of heater box is showing you where the actuator sits - after it's removed. So the actuator is not in that pic. It's location is.

 

Types

 

Removal

 

Removed

 

Best,

Master Class

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