Where is the Blend Door Actuator on the ford Aerostar?

 

On the dash board. It is the lever that says COOL on one side and WARM on the other.

Note the Areostar has a mechanically actuated blend door, other models have an electrically actuated blend door.

Did you ask the question you wanted to ask?

 

I'll explain the problem. The A/C blows out only from the vent and a little from the floor. The rear A/C only blows out - hot air only - from the floor behind the drivers seat. Someone mentioned that it could be that I need to replace the "Blend Door Actuator". It's a 94 Ford Aerostar. Thanks.

 

You have two separate AC evaporators, one serves the front and one the rear.

Sometimes folks will bypass the rear evaporator, sounds like that has happened with your van.

Does the front work well?

 

No. The front only blows out from windshield and from the floor.

 

There is a vent/hear door that is vacuum operated that could be your trouble. When vacuum is applied, air flow is directed to the panel vents, and without vacuum air goes to the floor.

It is located in the plenum on the right side behind the dash. If you are lucky you might be able to find a loose hose from the sucking sound and fix it without taking things apart. Not sure about that though I never tore into it that deep.

 

You mentioned in your explanation that the cool is coming out from the vent and a little from the floor. In the last message it is the windshield. If both, the vent and the windshield is right and both are carriyng A/C cooled or heated air then this should correspond to what the A/C is designed for and to what, i believe to recognize in my 97' A* when using position "normal A/C".

A/C cooling for the Footrest makes no sense to me..

Concerning the rear, i do also refer to be a Bypass

 

That was my mistake. I meant the windshield in the first thread too. But I'm not what you're referring to by bypass and how do I fix that?
Thanks.

 

It could be a loss of vacuum to the controllers. The clue is the rear blower blowing heat out the lower registers, where they should work when you enable the heater setting. The rear AC cooling should come from those registers in that duct that runs across the ceiling. That should be controlled with the same vacuum signal that controls the front blender doors. That they're both failing at the same time suggests the problem is the thing that's controlling them, and not the blenders themselves.

Look under the hood just above the air box for a very thin vacuum line. It may route to a T fitting and go into a plastic bulb, which is the vacuum reservoir. Look along the length of the line to see if there are cracks in it. It is somewhat rigid plastic, and can get brittle after years of exposure to under hood heat.

 

Have the same issue with no Rear A/C cooling/heating in mine. I just do suspect to have a once bypassed rear A/C because the Van was used for cargo deliveries ever since. Don't know how to fix but i know working on A/C is something difficult that cannot be done DIY.

Regarding the Airflow system on the Front here are the different stages:

OFF
In the OFF position, all doors are in the vacuum-applied position with the exception of the PANEL/DEFROST door.
VENT
Ventilation is delivered through the instrument panel registers when the function **** in the A/C control is set in the VENT position. In the VENT position, no vacuum is applied to the vacuum control motor and the outside/recirc. door is open to the outside. The air coming in through the cowl is discharged through the panel registers.
NORM A/C
In the NORM A/C position, outside air is allowed to enter the passenger compartment. The air passes through the A/C evaporator core and is cooled before reaching the passenger compartment.
MAX A/C
In the MAX A/C position, all doors are in the vacuum position with the exception of the HEAT/DEFROST door. Outside air is shut off and the passenger compartment air is recirculated to maximize cooling.
HEAT
In the HEAT position, no vacuum is applied to the vacuum control motor and the outside/recirc. door is open to the outside. Air is discharged through the heater outlet floor duct with a small amount going to the windshield defroster hose nozzle.
MIX
In the MIX position, outside air is discharged through the windshield defroster hose nozzle and the heater outlet floor duct.
DEFROST
In the DEFROST position, outside air is discharged through the windshield defroster hose nozzle with a small amount going to the heater outlet floor duct.
<source alldatadiy>

When switching from OFF to VENT to NORM A/C, i do feel cool wave coming to the Footrest for a short time, what is i believe normal.

 

..and the explanation for the rear system airflow

The front function selector **** controls the air distribution for both the front and the auxiliary systems and is located in the instrument panel at the right of the steering wheel. When the front control is in the VENT, MIX, or DEFROST position, the auxiliary unit will be in the same function and the air will be distributed through louvers to the floor. The damper door is driven by a vacuum control motor to its pre-determined position. When the front unit is in VENT, the rear unit will be in the recirculating function and will deliver the interior air through the A/C recirculating air duct. When auxiliary air conditioning is installed and the A/C control is in an A/C function, the rear unit will be also in A/C and delivers cooled air through the sidewall register and A/C recirculating air duct.

Have not gone through A/C issues in the past. We are living in a more cold climate. But to get Heat, i once replaced once in a emergency situation the entire Heater-Unit in a Torino with one from a 65' Land Rover.

All the best with Your Van!

97' XLT 3.0L Vulcan 98K

 

You were right on the money! I found that thin vacuum line disconnected, reconnected it, and now its working great. Plus I got a little A/C education. Thanks guys.

 

Cool! (bad pun intended)

 

Glad you are back in business.

I want to thank you for letting us know how things worked out, far too often we never find out what the end of the story was.

 

99% it is a vacuum leak. Just had the problem-- the actuator for the panel vents is if I recall immediately to the left front of the A/C dryer and there is a vacuum actuated servo inside the blower housing proper. Any leak/break will prevent enough vacuum pressure from activating the servos