GM Full-Size Trucks 1988-1998 Repair Information

Control Cables

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REMOVAL & INSTALLATION



Temperature, Defrost Or Mode Cables
1988-94 Models

See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel trim plate and then remove the control assembly.
  4.  
  5. Disconnect the cables at the control head.
  6.  
  7. If necessary, remove the instrument panel glove compartment.
  8.  
  9. Disconnect the cables from the heater case.
  10.  

To install:
  1. Attach the cables to the heater case. Make sure the cable(s) are routed properly.
  2.  
  3. If removed, install the glove compartment.
  4.  
  5. Install the control head and trim plate. Connect the battery cable.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Temperature and defroster control cables-1988-94 models



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Fig. Fig. 2: Typical temperature control and mode cables-1988-94 models

Vent Cable
1988-91 models
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the glove box. Remove the ash tray and let it hang.
  4.  
  5. Lower the steering column access panel and let it hang.
  6.  
  7. Remove the cable mounting bracket and disconnect the cable from the vent door.
  8.  
  9. Remove the cable from the access panel, then remove the cable from the vehicle.
  10.  

To install:
  1. Attach the cable to the access panel and the vent door.
  2.  
  3. Install the cable mounting bracket and the lower steering column access panel.
  4.  
  5. Install the ash tray and glove box assemblies.
  6.  
  7. Connect the negative battery cable.
  8.  

left vent cable-1992-94 models

See Figure 3

  1. Remove the steering column opening filler.
  2.  
  3. Disconnect the cable from the opening filler and from the air inlet valve.
  4.  
  5. Remove the cable from the vehicle.
  6.  

To install:
  1. Attach the cable to the to the air inlet valve and the steering column opening filler.
  2.  
  3. Install the steering column opening filler.
  4.  

right vent cable-1992-94 models

See Figure 3

  1. Remove the glove box and the steering column opening filler.
  2.  
  3. Loosen the cable attaching screw and disconnect the cable from the heater module.
  4.  
  5. Disconnect the cable from the opening filler.
  6.  
  7. Remove the cable from the vehicle.
  8.  

To install:
  1. Attach the cable to the to the heater module and the steering column opening filler.
  2.  
  3. Install the cable attaching screw and the steering column opening filler.
  4.  
  5. Install the instrument panel compartment.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Vent control cables-1992-94 models

Temperature Control Cable
1995-98 models

See Figure 4

  1. Disconnect the negative battery cable.
  2.  
  3. Roll the instrument panel back and then remove the control assembly.
  4.  
  5. Unplug the control assembly electrical connection.
  6.  
  7. Disconnect the cables at the control assembly.
  8.  
  9. If necessary, remove the instrument panel glove compartment.
  10.  
  11. Note the routing of the cables. Squeeze the retainer that attaches the cable to the temperature valve, squeeze the post and lift the cable end to remove it.
  12.  

To install:
  1. Cycle the temperature control to the full cold position.
  2.  
  3. Make sure the temperature door is closed.
  4.  
  5. Snap the cable onto the temperature valve and secure the cable by snapping it into the heater case.
  6.  
  7. Attach the cable to the control assembly making sure the cable is properly routed.
  8.  
  9. Attach the control assembly electrical connection.
  10.  
  11. Install the control assembly and roll the panel forward. Connect the battery cable.
  12.  



Click image to see an enlarged view

Fig. Fig. 4: Temperature and defrost control cable routing-1995-98 models

Defrost Control Cable
1995-98 models
  1. Remove the instrument cluster trim plate.
  2.  
  3. Remove the control assembly.
  4.  
  5. Unplug the control assembly electrical connection.
  6.  
  7. Disconnect the cables at the control assembly.
  8.  
  9. Disconnect the cable from the defroster valve.
  10.  

To install:
  1. Cycle the mode control to the heater position.
  2.  
  3. Make sure the defrost door is closed.
  4.  
  5. Snap the cable onto the temperature valve and secure the cable by snapping it into the heater case.
  6.  
  7. Attach the cable to the control assembly making sure the cable is properly routed.
  8.  
  9. Attach the control assembly electrical connection.
  10.  
  11. Install the control assembly and the instrument cluster trim plate.
  12.  

ADJUSTMENT



1988-94 Temperature Cable
  1. Remove the instrument panel compartment and door.
  2.  
  3. Loosen the cable attaching bolt at the heater case assembly.
  4.  

Ensure that the cable is installed in the bracket on the defroster duct assembly

  1. Place the temperature lever in the full COLD position and hold while tightening the cable attaching screw.
  2.  
  3. Install the instrument panel compartment and door.
  4.  

 
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