DeVille V8-4.6L VIN 9 (1995)
run after vehicle is shut down. To properly enable the afterblow mode, the following steps must be followed.
Enabling of the afterblow mode allows the blower motor to turn "ON" 45 minutes after the vehicle ignition is turned "OFF" if, during the last ignition
cycle, the compressor was engaged for more than three minutes cumulative run time. The ambient at ignition "OFF" must have been above 80° F (27°
C). The blower will then run three minutes and turn "OFF".
If necessary, refer to Section 8C1 "IPC Override Display" in the appropriate Service Manual to review operation.
1. Enter diagnostics and select PC Override.
2. Select output override option IS08 to display "Option I" value.
3. Use the "Warmer" button to add four (4) to this value to enable HVAC afterblow.
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Normal ISO8 value for the Concours, DeVille, Eldorado and Seville is 8 with RTD (RSS) or 0 with CCR.
4. When the correct number is reached, simultaneously press and hold the "ECON" and "FRONT DEFROST" buttons for three seconds to
permanently store the correct value.
Note:
The owner should be advised when this mode is enabled and the mode's function and purpose.
Parts information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use: