No Air through Vents
#1
No Air through Vents
Hello! I have been battling my air system in my 98 Ford Club Wagon(E350) 15 passenger V8 5.4 for two years now. My first issue was solved by replacing the blend door actuator. Then one of my AC vacuum lines broke so I rerouted it with a new line to get AC again! Now at the coldest time of the year, I am not getting any air through the vents. The rear vents blow air but only cold air. I am not too concerned about fixing the rear system at the moment.
I can hear the blower fan blowing. The heater core gets hot and I my fluids are at the correct level. I can feel cold air blowing right above the heater core area. I have tried to manually close/open the blend door to see if that produces air but that has not worked. My blend door doesn't close all the way unless I take the actuator off and close it manually. It leaves a 2 inch gap between the door and top the area. Is that normal? I am missing a little bit of foam that I need to fix and that could be cause of my gap.
I have tried to manually open and close the valves?(silver round things with black bases, metal arms that are connected to various colored pressure lines on the top of dash area) That does not give me any difference in air coming out of the vents.
When I turn my control **** to different setting it sounds normal.
My guess is there is vacuum line broken somewhere that I am missing. Is there a specific line to check that make air blow out of the vents?
I can hear the blower fan blowing. The heater core gets hot and I my fluids are at the correct level. I can feel cold air blowing right above the heater core area. I have tried to manually close/open the blend door to see if that produces air but that has not worked. My blend door doesn't close all the way unless I take the actuator off and close it manually. It leaves a 2 inch gap between the door and top the area. Is that normal? I am missing a little bit of foam that I need to fix and that could be cause of my gap.
I have tried to manually open and close the valves?(silver round things with black bases, metal arms that are connected to various colored pressure lines on the top of dash area) That does not give me any difference in air coming out of the vents.
When I turn my control **** to different setting it sounds normal.
My guess is there is vacuum line broken somewhere that I am missing. Is there a specific line to check that make air blow out of the vents?
#2
You'll need to check for vacuum leading to the Function Control located on the dash board, its the Heat, A/C, Vent, Defrost etc etc. Here's a photo of where the vacuum harness for the air flow control is located:
This is the back side of the Function Control Module:
And this is the schematic for the air flow control system:
HTH
This is the back side of the Function Control Module:
And this is the schematic for the air flow control system:
HTH
#3
#4
Even though the arms moving on the vacuum could the flaps be broken that they are attached to? I am also thinking that the heater core may not be getting hot enough. If nothing else sounds wrong with the system to you guys I am going to try and flush the heater core.
#6
#7
Try moving the right side vacuum motor under the center of the dash by hand to see if the attached arm moves and/or air is re-directed.
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