Blend door calibration?
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Melting Slicks
Joined: Jun 2017
Posts: 2,568
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From: Conyers Georgia
Blend door calibration?
Just watched a video on calibrating the head system blend doors on a gmail truck with dual climate control.....anybody heard of this for the c5?
Melting Slicks
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From: Clark, NJ
Thread Starter
Melting Slicks
Joined: Jun 2017
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From: Conyers Georgia
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From: Oregon
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Copied from another post:
Turn off the ignition.
Remove the Fuse of the HVAC control module located in the floor of the pass. side fuse box (fuse #27 only). There is another HVAC fuse (don't recall the #), it does not need removing.
Important: The module memory will not clear if the fuse is re-installed in less than 60 seconds (59 won’t reset it & you don't have to wait 5 minutes either). Wait 60 seconds minimum.
Re-install #27 fuse.
Start car, turn on AC
Turn off the ignition.
Remove the Fuse of the HVAC control module located in the floor of the pass. side fuse box (fuse #27 only). There is another HVAC fuse (don't recall the #), it does not need removing.
Important: The module memory will not clear if the fuse is re-installed in less than 60 seconds (59 won’t reset it & you don't have to wait 5 minutes either). Wait 60 seconds minimum.
Re-install #27 fuse.
Start car, turn on AC
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If you run a diagnostic on your DIC you will get a fault code in your HVAC module if the angle of the doors is not fully sweeping both open and closed. A recalibration will often solve this problem.
Heel & Toe
Joined: Jan 2023
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From: Huntsville, Alabama
This happened to me after replacing a battery. Hot on drivers side and ice cold on the passenger side. Clearing the HVAC codes on the dash recalibrated the doors without the need to pull any fuses. Anything that keeps me out of that passenger side floorboard is a plus!
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Drifting
Joined: Jul 2017
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From: S.E. Pennsylvania
Just tried pulling #27 fuse for a minute. Man, what a PITA getting to the fuse block down there... Anyway, I get no air movement but can hear the fan blowing. Tried turning the fan speed all the way up but get nothing from the vents... A/C is operating.
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Melting Slicks
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From: Conyers Georgia
Drifting
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From: S.E. Pennsylvania
Blows out the defroster opening and floor vents. Nothing from the middle top vent. Tried recirc mode and mixed mode. No air at all with fan at top speed. A/C on...
Safety Car
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From: Da U.P.
Are you guys all 70 years old and fat as **** or what? It's not that hard getting to that fuse panel. I am glad to hear that the recal procedure seems a lot less finicky on the C5 than it is on the trucks. The wife's Envoy is a nightmare any time you disconnect the battery, I end up hooking power to the thing elsewhere any time the battery comes out because it always overstrokes an actuator on that recal procedure which requires more setup than I've seen in this thread.
Race Director
Joined: Oct 2004
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Are you guys all 70 years old and fat as **** or what? It's not that hard getting to that fuse panel. I am glad to hear that the recal procedure seems a lot less finicky on the C5 than it is on the trucks. The wife's Envoy is a nightmare any time you disconnect the battery, I end up hooking power to the thing elsewhere any time the battery comes out because it always overstrokes an actuator on that recal procedure which requires more setup than I've seen in this thread.
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Melting Slicks
Joined: Jun 2017
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From: Conyers Georgia
