Vent, defrost, not working

[ervbassin]

98 Black SHO, everything works, except when i try to change the air flow from windshield defrost, to any of the other positions nothing happens.
The fan has all speeds, the display correspons to the button pushed, but the air flow stays at the windshield. Is there a fuse, or solenoid that needs replaced???. Please help.
Thanks in Advance;
ervbassin

 

[SHOZ123]

Run the EATC self test. But it may be the vacuum hose has come off under the hood. It's a small plastic line that comes off the large plastic tube that runs across the back of the engine near the firewall. At the passenger end there is a tee, one goes to the EATC controls the other goes to a vacuum tank in the fender.

Self Test
1. NOTE: Intermittent (run time) trouble codes will be deleted after 80 ignition cycles.
The remote climate control module is capable of displaying both self-test faults and intermittent (run time) faults on the integrated control panel. To obtain these codes, perform the following EATC on-board diagnostics test:
• On-board diagnostics should be run in ambient temperatures between 10° C (50°F) and 32°C (90° F). Record all diagnostic trouble codes (DTCs) displayed during diagnostic test mode.
• Turn ignition switch to RUN position.
• Push both OFF and FLOOR buttons simultaneously, then press AUTO within two seconds.
• The test may run as long as 30 seconds while the display will show a dashed line in the center of the display window.
• After about 20 seconds, a DTC will appear in the display. Refer to the Diagnostic Trouble Code Index to identify the proper diagnostic procedures.


Condition(s):
Improper/Erratic Direction of Air Flow from Outlets

Possible Source(s):
No vacuum to A/C control (19980).
A/C control leaks vacuum.
Kinked/pinched vacuum hose.
Leaking vacuum control motor.
Leaking A/C vacuum reservoir tank and bracket (19A566).
Leaking A/C vacuum check valve (19A563).
Vacuum actuator arm not connected to door crank.