Having AC problems. When car is first started, the AC will only blow warm (AC…
How to replace ac/heater control panel.. vacuum lines may not be in right?
Should be only one way for the vacuum harness connector to attach. Maybe the AC Heater Control Panel Diagram below will help. It looks like the vacuum line effect the re-circulation of the Air Conditioning.
- Remove Control Panel Bezel
- Remove Center Air Duct
- Remove the screws that secure the AC Heater Control to the instrument panel
- Remove the A/C-heater control from the instrument panel to gain access to the vacuum harness, control cables and wire harness at the rear of the A/C-heater control.
NOTE: To aid in reinstallation, note the installed position of the vacuum harness prior to removal.
- Disconnect the vacuum harness and wire harness from the rear of the A/C-heater control (Vacuum Harness, Control Cables and Wiring Harness).
NOTE: To aid in reinstallation, note the installed positions of the control cables prior to removal.
- Disconnect the control cables from the mode and temperature control levers at the rear of the A/C-heater control.
- Remove the A/C-heater control from the vehicle.
- A/C-HEATER CONTROL
- WIRE HARNESS CONNECTOR
- MODE CONTROL LEVER
- CABLE RETAINING CLIP
- MODE CONTROL CABLE
- TEMPERATURE CONTROL LEVER
- CABLE RETAINING CLIP
- TEMPERATURE CONTROL CABLE
- VACUUM HARNESS CONNECTOR
AC Heater Control Panel Description
Both the heater-only and heater-A/C systems use a combination of, electrical, cable, and vacuum controls. These controls provide the vehicle operator with a number of setting options to help control the climate and comfort within the vehicle.
The A/C-heater control for the heater-only or the heater-A/C system is located to the right of the instrument cluster in the instrument panel. The A/C-heater control contains rotary-type knobs. There is a blower motor speed switch, mode control switch, temperature control, and airflow control.
The A/C-heater control cannot be repaired and, if faulty or damaged, it must be replaced. The control knobs and the illumination lamps are available for service replacement.
Vehicles equipped with A/C use vacuum to operate the re-circulation door. A vacuum check valve is connected to the brake booster vacuum supply. The vacuum check valve is designed to allow vacuum to flow in only one direction through the accessory vacuum supply circuits and to stabilize the vacuum within the HVAC re-circulation circuit whenever the vehicle is accelerating or engine vacuum varies due to operating conditions.
The use of a vacuum check valve helps to maintain the system vacuum needed to retain the selected heating-A/C mode settings. The check valve will prevent the engine from bleeding down system vacuum through the intake manifold during extended heavy engine load (low engine vacuum) operation.
The vacuum check valve cannot be repaired and, if faulty or damaged, it must be replaced.