Made in Spain vs Swiss Made. What a difference. The later models certainly look like an improvement and a worthy upgrade if you ask me. Thanks for the write-up.

 

Ha. I just made the connection to Swiss made.
Talking about timing and it's a doggone Rolex after all!

 

Note on the case and the pot - the 120 degrees notation. That's part of what's different - and they aren't all identical. They have different length arms, different starting positions for the arms, and different ranges of motion for the arms. On my '11 Turbo - I think there are at least 6 different part numbers, indicating to me that no single motor is going to work in every position.

 

Too bad it's not simpler as far as the part numbers...
We're getting closer though.
We can cross reference everything one day. But I think in the mean time the major takeaways are:
1st early design vs. improved Swiss design.

Then just put away the voodoo and verify:

1. Motor OK
2. Mechanical operation of mechanism
3. Working potentiometer with clean feedback (not noisy)
4. Arm properly timed to pot.
IMO No reason to swap out parts unless the above are NG.

 

Doesn't matter what the resistance is. They are wired as a voltage divider. If you put 12 VDC at one end, ground at the other, and the wiper at the 50% mark, you will get 6 VDC at the wiper regardless of what the total pot resistance is.

The only thing that a lower resistance pot does is source more current. Remember I = E/R?

Where:
I = current in amps
E = Volts
R = Resistance in Ohms

If you like math, here is the equation for a voltage divider.

 

Are you sure?

I looked at what I thought were 955 Porsche part numbers at AutoAtlanta and the numbers are all different!

Driver's Side:
1. 955 624 901 01 ==> Touareg Equivalent 7L0-907-511-AB
2. 955 624 905 01 ==> Touareg Equivalent 7L0-907-511-AE
3. 955 624 902 01 ==> Touareg Equivalent 7L0-907-511-AD
7. 955 624 907 01 ==> Touareg Equivalent 7L0-907-511-AK
8. 955 624 906 01 ==> Touareg Equivalent 7L0-907-511-AJ

Passenger Side:
10. 955 624 908 01 ==> Touareg Equivalent 7L0-907-511-AL
11. 955 624 909 01 ==> Touareg Equivalent 7L0-907-511-AM
15. 955 624 913 01 ==> Touareg Equivalent 7L0-907-511-AG
16. 955 624 912 01 ==> Touareg Equivalent 7L0-907-511-AH

Touareg equivalents seems to be about $160 new versus $225 for the OEM Porsche version.

Diagram and Description from Cayenne 2003-06

Different part numbers tel me that the part is physically/mechanically/electrically different.

 

I ordered a complete set from Ebay with the wiring harness and this was what I got. Note that all the arms are different. Most arms had a letter in them which I wrote in blue ink.

Unfortunately, the first three units I bench tested had two bad servos, so I returned the lot of them.

Driver's Side


Passenger Side

 

Great info, specifically the table of part numbers! Good point about the voltage divider.
Looks like the one actuator I needed and got from eBay is a Touareg Equivalent 7L0-907-511-AK.
I researched this months ago, bought the part, but then forgot everything, like the fact that they are indeed different. Sorry.

This is turning out to be a great post. Below, I added the descriptions of the actuator functions:

YEAR DESCRIPTION 2003-2006 4-ZONE AIR CONDITIONING SYSTEM
1 95562490101 Electric Motor Defroster Flap $227.37
2 95562490501 Electric Motor Air Exhaust Lateral Left $227.37
3 95562490201 Electric Motor Air Exhaust Centre Left $227.37
7 95562490701 Electric Motor Temperature Mixing Flap Left $227.37
8 95562490601 Electric Motor Footwell Flap Left $227.37

10 95562490801 Electric Motor Temperature Mixing Flap Right $227.37
11 95562490901 Electric Motor Footwell Flap Right $227.37
15 95562491301 Electric Motor Air Exhaust Lateral Right $227.37
16 95562491201 Electric Motor Air Exhaust Centre Right $227.37

Instead of giving advice, I'll just say what I'm going to do. Since only my actuator for mixing heat on the left side is bad, that's the only one I'll pull out.

For that bad actuator and others I encounter in the future, using the tables of part numbers, I will get newer improved replacements and check their function first.
Specifically, 9V battery to first 2 pins for motor operation (see photos above for which are 1st 2 pins)
Ensure the gear and arm mechanism works smoothly
Clean with contact cleaner spray and check the potentiometer

Depending on the ease/difficulty of getting to my bad actuator, I'll decide whether I want to replace them all wholesale in the future. Mine is a 2003.

 

That one is on the lower forward edge of the pack and a little easier to get at.

This link by dpatel710 is helpful as far as dismantling to get to the servos. You may be able to leaves some of those parts in place to get to the one you need to replace.

 

Cool, thanks.
Recently discovered my iPhone's magnifying glass feature. Pretty awesome.
Here are pics of where I found my Touareg part numbers for future readers.




I should have been a photographer.

 

Interestingly enough, when I called our local VW dealer for part # 7L0907511AK they quoted $264.

My local Porsche dealer quoted (with PCNA discount) $200 for 955 624 907 01. It was $216 without the discount.

 

Ha, the VW dealer probably has caller ID and you're flagged as a Porsche owner and an agitator. j/k

 

Snippage of some text and pics to shorten this up..
Exactly. Isn't that what I said?

 

Can someone help me with my earlier post (#12)?

Just replaced all actuators.

Before reassembling, I wanted to check functionality. I connected the "black box" (next to kessy that I left connected) and hooked battery back up.

I inserted key and turned on (engine off) but the hvac and pcm did not come on. The dash lit up with the mileage and the Porsche logo.

Will the hvac work with the engine off?

What else could be wrong?

 

Well, my HVAC doesn't work with the engine or with the car off, but that's because my servos are missing and what ones I still have are bad. However, the controls will work with the engine off and the key in the ACC position.

I would start by reviewing your work to see if there is a connector not seated or missing. Then I would consider the fuse on the passenger size.

Keep asking yourself what changed. Something changed to cause the condition.