Some ATC equipped vehicles may exhibit a lack of
passenger comfort in sunny weather. This will not
occur in night operation. This most likely occur in
the early afternoon. Verify that the ATC system is
functioning properly. Inspect the location of the sun
sensor. The sun sensor must protrude approximately
1/4 inch above the instrument panel top cover to
insure proper operation. If the sensor does not pro-
trude 1/4 inch, perform the following procedure:
• Confirm that the top cover is properly installed
• Remove the top cover
• Remove fasteners from sun sensor
• Install one 1/4-20 nut per fastener under the sun
sensor so that it is shimmed higher
• Reinstall the sun sensor. Do not overtighten
screw. If a longer screw is required, use 8-15x1 inch.
TEMPERATURE DOOR ACTUATOR
The blend-air (temperature) door actuator is an
electric motor which mechanically positions the tem-
perature door. A feedback strip in the actuator allows
the computer control to know the exact position of
the temperature door at all times. The blend-air door
actuator is not serviceable and must be replaced if
found to be defective.
The temperature door actuator is located at the
bottom of the heater housing at the center tunnel
(Fig. 28).
REMOVAL
(1) Open hood and disconnect the negative battery
cable remote terminal from the remote battery post
(Fig. 13).
(2) Remove left and right underpanel silencer/
ducts.
(3) Remove two screws from actuator which are
accessible from the right side of center stack.
(4) Remove one screw from actuator on left side.
(5) Pull actuator straight down from shaft and dis-
connect electrical connection. Upon removal, note the
shaft position of the actuator, because the shaft on
this motor is keyed. When installing new actuator, its
shaft must be positioned in the same location.
INSTALLATION
For installation, reverse the above procedures.
HVAC UNIT HOUSING
REMOVAL
(1) Open hood and disconnect the negative battery
cable remote terminal from the remote battery post
(Fig. 13). This must be done to prevent accidental air
bag deployment.
(2) Remove instrument panel from vehicle. Refer
to Group 8E, Instrument Panel and Systems for
Removal and Installation procedures.
(3) Using an A/C recovery unit, remove all R-134a
refrigerant from the A/C system.
(4) Drain the engine cooling system.
(5) Remove air cleaner hose and air distribution
duct from the engine.
(6) Remove spring type fasteners to heater hoses
at the dash panel and remove hoses from heater core.
Plug the heater core inlet and outlet tubes to prevent
anti-freeze from spilling on the vehicle interior dur-
ing removal. If an appropriate plug cannot be found
pull back carpet and use caution when removing
unit. Keep the heater tubes elevated to prevent spill-
age of coolant.
(7) Remove one nut at expansion valve retaining
both A/C lines to expansion valve. After removing
lines cap the expansion valve openings and the A/C
hose openings. This will prevent any dirt or moisture
from entering the refrigerant system during servic-
ing.
CAUTION: The lubricant used in this air condition-
ing system absorbs moisture readily (similar to
brake fluid). Do not leave any portion of the system
open for extended periods of time.
(8) Remove the three retaining nuts from the
studs. These studs project through the dash panel
into the engine compartment.
(9) Remove two screws to defrost duct and remove.
(10) Remove two nuts, two screws attaching hvac
housing to dash panel.
(11) Remove four nuts retaining rear seat heat
duct and remove.
(12) Remove rear seat heat duct elbow push pin
fastener.
(13) Disconnect HVAC harness connector.
(14) Gently pull hvac unit housing rearward from
dash panel, being careful not to spill any coolant into
passenger compartment.
INSTALLATION
For installation, reverse the above procedures.
24 - 28 HEATING AND AIR CONDITIONING LH
REMOVAL AND INSTALLATION (Continued)
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