GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Control Head


Please refer to General Information & Maintenance of this guide before discharging/recovering the A/C system or disconnecting air conditioning lines. Damage to the air conditioning system or personal injury could result. Consult your local laws concerning refrigerant discharge and recycling. In many areas it may be illegal for anyone but a certified technician to service the A/C system. Always use an approved recovery station when discharging the air conditioning.


See Figure 1

  1. Disconnect the negative battery cable.
  3. Remove the instrument panel trim plate or accessory trim plate, as applicable.

Most dash trim plates on these vehicles are retained by screws and/or snap fasteners. Make sure all screws are removed before attempting to remove the trim plate. If retained by snap fasteners, it may be necessary to pry the plate loose, BUT take care not to force and break the usually fragile plastic pieces.

  1. Remove the control head-to-instrument panel screws, then pull the control head from the instrument panel.

Click image to see an enlarged view

Fig. Fig. 1: Common late model control head assembly

  1. Disconnect the vacuum hoses, electrical connectors and/or the control cables from the control head, as applicable. Make sure each connection may be only made one way, or tag hoses/wires and cables before removal.
  3. Remove the control head assembly from the vehicle.
  5. If necessary, remove the blower switch knob and spring clip, then remove the switch from the control head.

To install:
  1. Install the switch to the control head, then connect the spring clip and the blower switch knob, if necessary.
  3. Install the control head assembly in the vehicle.
  5. Fasten the vacuum hoses, electrical connectors and/or control cables to the control head as tagged during removal.
  7. Install the control head to the instrument panel and fasten the control head-to-instrument panel screws.
  9. Install the instrument panel trim plate or accessory trim plate, as applicable.
  11. Connect the negative battery cable.