See Figure 1
Until the 1989 model year, the heater/air conditioning system of the Tempo/Topaz was cable controlled through the temperature and function control cables.
The vacuum system incorporated into the vehicle after 1989 includes a vacuum motor and assembly fastened to the floor defrost duct of the ventilation system. This vacuum system is controlled through the climate control panel on the dash.
In the event you question the proper functioning of the vacuum motor as a source of a ventilation problem, make sure it is not a vacuum line fist. Because this system works on a limited number of vacuum lines, testing this system is fairly simple.
- Remove negative battery cable.
- Remove the ventilation system control panel from the instrument panel as outlined earlier.
- Carefully pry the vacuum hose connection away from the control panel.
- Using a hand pump, test each line to make sure it can hold a vacuum. If the line is unable to hold a vacuum, check for cracks or holes in the line and repair.
- Fasten the vacuum line connection to the control panel.
- Push control panel into instrument panel.
- Connect negative battery cable.
- Check for prior ventilation system functioning.