Fan speed
03-17-2015, 01:08 AM
#1
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Fan speed
The left and right toggle switches on my 957 don't seem to work independently any more. If you raise it on one side, the other side fan speed increases too. Same with lowering the fan speed.
Anyone ever seen anything like this?
Anyone ever seen anything like this?
03-17-2015, 01:56 AM
#3
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03-17-2015, 11:48 AM
#8
Nordschleife Master
03-17-2015, 12:14 PM
#9
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03-17-2015, 01:54 PM
#10
Last edited by AGARubberDuck; 03-17-2015 at 11:03 PM.
03-17-2015, 03:26 PM
#11
The V8 Porschephile
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Lupo is right, there is only one fan so basically, the fan motor will supply both sides with the same air, same speed and same volume.
However, there are individual temperature sensors on each side that control separate motorized air flaps or dampers which are controlled via the fan speed & temperature settings. Although the fan speed will not change on one side, the air flap will divert the excess air back through the system; thus diminishing the air flow to that particular side.
In answer to the OP's post, the only way to properly diagnose the HVAC system is by using a PIWIS to find a fault code and to cycle all the flaps and verify their operation.
However, there are individual temperature sensors on each side that control separate motorized air flaps or dampers which are controlled via the fan speed & temperature settings. Although the fan speed will not change on one side, the air flap will divert the excess air back through the system; thus diminishing the air flow to that particular side.
In answer to the OP's post, the only way to properly diagnose the HVAC system is by using a PIWIS to find a fault code and to cycle all the flaps and verify their operation.
03-17-2015, 07:28 PM
#12
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It seems the unit used to work both sides independently (or at least showed different fan speeds) unit I took the unit out when I put in the Dynavin unit. I did RTFM and didn't see any reference except the toggle switches controls the air volume.
I think I tried the "auto" button early on in addition to trying to other various button combinations.
That said, the HVAC interface under the Cayenne logo does not look like AGARubberDuck's picture (not sure what year his is). I only have one set of icons indicating which outlet the air comes through (dash, front or foot vents), not two. Maybe that indicates he has a system where that can be adjusted independently.
I think I tried the "auto" button early on in addition to trying to other various button combinations.
That said, the HVAC interface under the Cayenne logo does not look like AGARubberDuck's picture (not sure what year his is). I only have one set of icons indicating which outlet the air comes through (dash, front or foot vents), not two. Maybe that indicates he has a system where that can be adjusted independently.
03-17-2015, 07:36 PM
#13
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That said, the HVAC interface under the Cayenne logo does not look like AGARubberDuck's picture (not sure what year his is). I only have one set of icons indicating which outlet the air comes through (dash, front or foot vents), not two. Maybe that indicates he has a system where that can be adjusted independently.
Cheers,
TomF
03-17-2015, 10:18 PM
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Edit: I think I nailed it...
The front liquid crystal display can show the following functions:
Selected temperature, individually for the left & right side, front & back
Air Volume (fan setting), individually for the left & right side, front & back
Air distribution, individually for the left & right side, front & hack
Time is synchronized to the PCM or instrument panel
...
G - Buttons for Air Volumes (Fan) left side
(This example is valid for all possible settings)
a The volume of air can be selected individually for all four AC zones.
H - Button for Temperature, left side
(This example is valid for all possible temperature settings)
The temperature can be selected individually for all 4 AC zones.
...
- Motor for Air Volume
With 4 zone Climate Control it is possible to distribute the air created by the fan motor both separately and individually to each rear zone. The positions of the two flap motors for this can be see in section "Air and Flap Control" diagram 8_O5_O3.
Selected temperature, individually for the left & right side, front & back
Air Volume (fan setting), individually for the left & right side, front & back
Air distribution, individually for the left & right side, front & hack
Time is synchronized to the PCM or instrument panel
...
G - Buttons for Air Volumes (Fan) left side
(This example is valid for all possible settings)
a The volume of air can be selected individually for all four AC zones.
H - Button for Temperature, left side
(This example is valid for all possible temperature settings)
The temperature can be selected individually for all 4 AC zones.
...
- Motor for Air Volume
With 4 zone Climate Control it is possible to distribute the air created by the fan motor both separately and individually to each rear zone. The positions of the two flap motors for this can be see in section "Air and Flap Control" diagram 8_O5_O3.
Here's for the front:
The geometric design of the front heating unit housing is almost identical for the
4-zone or 2-zone climate control. With 4-zone climate control, the valves for the mid
and side vents as well as the floor vents (please see the block diagram) can be
controlled independently of each other. There are also three additional motor operators.
They can be found on the right side of the air mixing area across from the
motor operators in positions 2, 3 and 4 (see diagram 8_04_03).
4-zone or 2-zone climate control. With 4-zone climate control, the valves for the mid
and side vents as well as the floor vents (please see the block diagram) can be
controlled independently of each other. There are also three additional motor operators.
They can be found on the right side of the air mixing area across from the
motor operators in positions 2, 3 and 4 (see diagram 8_04_03).
8.04.03
Last edited by ubermich; 03-17-2015 at 11:20 PM. Reason: Additional info
03-18-2015, 05:24 AM
#15
One fan.
Servo motor flaps along with fan speed control the amount of airflow if 2 different airflow rates are selected between driver/ passenger.
Servo motor flaps along with fan speed control the amount of airflow if 2 different airflow rates are selected between driver/ passenger.
Last edited by bigbuzuki; 03-18-2015 at 05:42 AM.