A/C Vent Technical Question
Thread Starter
Racer
Joined: Aug 2006
Posts: 318
Likes: 0
From: Corona ca
A/C Vent Technical Question
Complaint: I can get full flow through the dash vents or floor vents but when I select the bi-level setting I only get flow through the floor vents.
Without having ever looked at a service manual or having any idea how the A/C vents are controlled in a C6, I'm wondering if there is a normalizing procedure that can be performed to the blend door system.
I have late model Mercedes experience and it's not uncommon to have to normalize the stepper motors when we have a temperature or flow complaint. The stepper's full open/full close values can change from the actual vent position over time and require this.
I don't have access to a Tech II so I'm wondering, if there is a procedure, can it be done without it?
Without having ever looked at a service manual or having any idea how the A/C vents are controlled in a C6, I'm wondering if there is a normalizing procedure that can be performed to the blend door system.
I have late model Mercedes experience and it's not uncommon to have to normalize the stepper motors when we have a temperature or flow complaint. The stepper's full open/full close values can change from the actual vent position over time and require this.
I don't have access to a Tech II so I'm wondering, if there is a procedure, can it be done without it?
Last edited by shockwaveharry; Aug 27, 2009 at 10:56 PM. Reason: corrected wrong information
Le Mans Master
Joined: Jan 2005
Posts: 5,611
Likes: 5
From: Thousand Oaks California
Complaint: I can get full flow through the dash vents or floor vents but when I select the bi-level setting I only get flow through the floor vents.
Without having ever looked at a service manual or having any idea how the A/C vents are controlled in a C6, I'm wondering if there is a normalizing procedure that can be performed to the blend door system.
I have late model Mercedes experience and it's not uncommon to have to normalize the stepper motors when we have a temperature or flow complaint. The stepper's full open/full close values can change from the actual vent position over time and require this.
I don't have access to a Tech II so I'm wondering, if there is a procedure, can it be done without it?
Without having ever looked at a service manual or having any idea how the A/C vents are controlled in a C6, I'm wondering if there is a normalizing procedure that can be performed to the blend door system.
I have late model Mercedes experience and it's not uncommon to have to normalize the stepper motors when we have a temperature or flow complaint. The stepper's full open/full close values can change from the actual vent position over time and require this.
I don't have access to a Tech II so I'm wondering, if there is a procedure, can it be done without it?
Try doing a reset of the HVAC contol head by turning on ignition and press and hold these 3 buttons simultaneously for 10 seconds:
Front Defrost
Rear Defog
Fan Up
Melting Slicks
Joined: Aug 2006
Posts: 2,167
Likes: 11
From: Powell TN
Cruise-In VIII Veteran
Don't forget to re-index the windows.
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