Thank you for the reply, this is a common concern on the Econolines, there is a heater case problem, the actuator arm binds and breaks the blendoor, the heater case is the recommended repairs. here is a diagram of the component locations.
The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. Function selector position determines heating or cooling and air distribution. The temperature blend control setting determines air temperature.
The manual climate control components are used to:
- select air inlet source (outside or recirculated).
- select blower motor speed.
- select discharge air temperature (temperature blend).
- select discharge air location (defrost, panel, floor).
- select A/C compressor clutch operation.
|1 ||18A318 ||Vacuum Control Motor-(Floor/Defrost Door)|
|2 ||18A318 ||Vacuum Control Motor-(Panel Door)|
|3 ||18A318 ||Vacuum Control Motor-(Air Inlet Door)|
|4 ||19E616 ||A/C Electronic Door Actuator Motor|
|5 ||18591 ||Heater Blower Motor Switch Resistor|
|6 ||19980 ||Manual A/C Control Assembly|
Here is the removal and install for the blendoor actuator.
Actuator-A/C Electric Blend Door
- Disconnect the battery ground cable.
- Remove the A/C electronic door actuator motor (19E616).
- Disconnect the A/C electronic door actuator motor connector.
- Remove the four screws.
- Remove the A/C electronic door actuator motor.
- To install, reverse the removal procedure.
Here is a copy of the service bulletin for the heater case.
- AIR CONDITIONING - NO TEMPERATURE CONTROL - VEHICLES BUILT THROUGH 2/25/98
- HEATER - NO TEMPERATURE CONTROL - VEHICLES BUILT THROUGH 2/25/98
|Publication Date: MARCH 16, 1998|
|LIGHT TRUCK:||1997-1998 ECONOLINE|
This TSB article is being republished in its entirety to include 1998 model year vehicles and correct the build date of the affected vehicles.
Absence of temperature control on some vehicles may be due to the blend door actuator shaft having an interference fit with the blend door, thus causing the blend door to break.
Replace the heater case assembly with a revised heater case assembly. Refer to the following Service Procedure for details.
- Open both driver and passenger side doors.
- Install memory saver module, then disconnect battery negative cable.
- Drain cooling system.
- Using Heater Hose Disconnect Tool (T85T-18539-AH), disconnect and plug heater hoses from the heater core.
- Remove inside engine cover.
- Remove passenger side instrument panel finish panel.
- Remove driver side instrument panel finish panel.
- Remove passenger side instrument panel finish panel reinforcement.
- Remove passenger side instrument panel dash brace.
- Remove top instrument panel retaining screws.
- Remove upper left access panel.
|CAUTION:||IF THIS NUT IS REMOVED COMPLETELY, PROBABLE DAMAGE TO COMPONENTS WILL OCCUR FROM INSTRUMENT PANEL FALLING.|
- Loosen instrument panel-to-main bracket retaining nut.
- Remove instrument panel-to-center finish panel retaining bolts.
- Slightly raise the instrument panel, then place a 38.1mm thick by 101.6mm long by 101.6mm wide (1-1/2"x4"x4") block of wood on the right front portion of the engine cover opening. This will hold the instrument panel in a raised position.
- Remove RH kick panel from the engine cover side.
- Remove heater case cover.
- Remove heater core.
- Disconnect the door temperature blend actuator wiring.
- Remove heater case assembly.
- Install revised Heater Case Assembly (F7UZ-18478-CA).
- Transfer temperature blend door actuator to revised heater case assembly.
- Reverse Steps 1-19 for installation of the revised heater case assembly. Tighten instrument panel bolt to 2-3 N-m (18-27 lb-in).
|PART NUMBER||PART NAME|
|F7UZ-18478-CA||Heater Case Assembly|