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HVAC Bi-level mode inop.


buickguy62

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Hi ,

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My new (to me) 1990 Reatta has inoperative bi-level outlets-no air comes out regardless of the set mode. About 85% of the air goes to the defroster, about 15% to the floor.

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I didn’t see any error code when I ran the BCM diagnostics.

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Cruise control does work, so I likely have vacuum to the door actuator.

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I overrode the air door output signal (BS01) and monitored the air door actual position feedback (BD23), and it tracked the driven input, so I believe the actuator is working. I assume the feedback is on the actuator, not the door.

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I’m afraid I may have a problem with the linkage from the actuator to the door, I read a ‘horror’ case a few days earlier, can’t find it now—must have been on this forum, where the rod to the door was slipping or broken from the actuator, hope I don’t have to go there.

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Any suggestions are welcome.

Thanks,

Tom

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