Hissing sound coming from my radio/heater control panel | Page 2 | Ford Escort Owners Association (FEOA)

Hissing sound coming from my radio/heater control panel

Discussion in '2nd Gen 1991-1996 1.9L SOHC' started by gnx547, May 10, 2012.

  1. schultkl

    schultkl FEOA Member

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    Second update: re-looking at your photos...you need a new heater control assembly, for sure. : o )

    First, that rightmost cable, the airflow control cable, seems unsecured (as I think you noted). I am almost positive you need to secure that for the airflow lever arm to properly extend/retract the cable...which almost certainly accounts for why you always have air to the vents and very little air to the defroster vents...you move the airflow lever but do not actually extend/retract the cable properly...thus the vented air when you think you have selected DEFROSTER...because the cable does not get extended all the way, you likely just shove the cable assembly around instead of extending the cable and moving the white circular cam on the passenger side of the heater box.

    Second, it probably does not matter, but are you sure the vacuum line connector goes with that gold clip? On my old heater control assembly, it seems like I have a switch in that spot, and the vacuum connector sits at the very rear of the heater control assembly. The switch closes a circuit when the arm moves into the DEFROSTER position. Due to the state of the heater control assembly, I am not sure if you lack the switch due to damage to the heater control assembly or because you do not have AC.

    [​IMG]

    * Note: the pic above has a broken black plastic peg, which should go into the hole in the brassy metal arm, but got sheared off...linking for illustration only.
  2. gnx547

    gnx547 FEOA Member

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    Yup, I was pretty sure if the selector is on defroster no air should come out of the vents. Sounds like it has to do with this vacuum line with that broken black tab

    Also the temp selector does not retract back all the way to cold. It just stays in the middle. I have to manually turn the lever by hand at the driver side unit. When I do that the temp selector moves all the way to the left/cold temp. I'm guessing the cable is bad or stretched out. Also the plastic clip that holds the cable on top the unit is broken off.

    Are both the AC & NON-AC control units the same? Besides having the AC button, can I use this control unit?
  3. schultkl

    schultkl FEOA Member

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    The vacuum line and the broken black tab would only cause issues with control of the fresh air/recirc baffle above the blower motor, since the vacuum line only controls that one thing. The defroster/vents issue stems from the damaged airflow control cable mounting on the top of the control unit. : o )

    Not sure about the temperature control arm...since you will pull the control unit anyway, you will get a new temp cable as well.... : o ) So, hopefully the problem goes away when you replace the unit.

    In the Ford parts rendering, below, you can see the two different switches for the control unit (#18578--w/o the AC switch; and #19986--with the AC switch)...since the rest of the control unit assembly seems the same, I guess the switches represent the major difference between the control units...they both should work...just ensure the car you pull it from has the vacuum line and not the control cable for the fresh air/recirc vent door:

    [​IMG]

    Via: http://www.fordparts.com/Commerce/P...&search=true&year=1996&make=Ford&model=Escort
  4. gnx547

    gnx547 FEOA Member

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    I went to the junkyard today and I found a hvac control unit with AC on a 94 lx. It is not the same as the one I have with no AC on my 96. The 94 with AC does not have the vacuum connector like the 96 has. I guess the AC hvac control unit is different than the non AC. Or maybe a 95 or 96 with AC might be the same as the one I have. If not I will have a hard time finding a hvac control unit for a 96 with no AC.
  5. schultkl

    schultkl FEOA Member

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    Yeah...you have to take some care in looking at the HVAC models across years...whether it uses the control cable or the vacuum line to control the RECIRC/MAX AC depends on the year. I have a 1996 2nd gen and the HVAC has AC + vacuum line. When I went to the junkyard a lot of earlier years had the control cable instead of the vacuum line. Not so much an AC/NON-AC thing as pulling a HVAC unit from a year close to yours (if you can find one)...
  6. gnx547

    gnx547 FEOA Member

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    Does anyone know what Mazda models and years share the same interior parts as the 91-96 Escort?
  7. schultkl

    schultkl FEOA Member

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    No...I think a post exists which does, though...somewhere. : o P
  8. Intuit

    Intuit FEOA Member

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  9. LeraiPalmer

    LeraiPalmer New Member

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    Check a different junkyard. Every junkyard across the US has escorts. You could also try ebay

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