Allante V8-273 4.5L (1991)
Evaporator Core: All Technical Service Bulletins
Procedure D (Enabling Afterblow Mode)
This procedure is for 1994 Cadillac Concours, DeVille, Eldorado and Seville. These vehicles have an afterblow feature to allow the A/C blower to 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 BC1 "IPC Override Display" in the appropriate Service Manual to review operation.
1.
Enter diagnostics and select IPC Override.
2.
Select output override option ISO8 to display "Option 1" value.
3.
Use the "Warmer" button to add four (4) to this value to enable HVAC afterblow.
-
Normal IS08 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:
