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1) Remove right instrument panel sound insulator. Remove
temperature control cable from heater housing. Move temperature
control knob from full cold to full hot setting. If cable binds or
pulley does not rotate freely, replace cable. Set temperature control
knob to detent position halfway between full cold and full hot
setting.
2) If control cable pulley is offset by 5-10 degrees toward
full cold side, no adjustment is necessary. See Fig. 2. If control
cable pulley is offset toward full hot side, remove spring from
control cable pulley. Rotate pulley 5-10 degrees toward full cold.
Install control cable pulley spring. Install temperature control cable
to heater housing.
Fig. 2: Adjusting Temperature Control Cable
Courtesy of General Motors Corp.
TROUBLE SHOOTING