What is this part?

[ekstroemtj]

Open the hood and get access to the place where the fuse

Box is in the engine compartment drivers side. Here i found this part

Hanging arround. What is it? Where it has to be installed? Thank you

[ekstroemtj]

Checked on my other cayenne. Found where it has to be . Thankx

[hahnmgh63]

Looks like a Chime or Buzzer

[hthighway]

Power Brake Booster Sensor - 2006 Volkswagen Touareg (7L0907643A) ??

http://www.vwparts2go.com/volkswagen/touareg/7l0907643a/?year=2006&trim=base&engine=4-2l-v8-gas&group=brake&subgroup=sensors&part_name=power-brake-booster-sensor

[Loren]

Air quality sensor for vehicles with air conditioning

(click to enlarge)

[wrinkledpants]

"The air quality sensor monitors ambient air pollution and sends a signal to the Climate Control Unit. The control unit will command the recirculation flap to close if the concen- tration of pollution is excessive.

The air quality sensor reacts to oxides of nitrogen (NOx), Carbon Monoxide (CO) and Sulfur Dioxide (SO2).
The air quality sensor is in the fresh air inlet on the left side. "

[hahnmgh63]

Pretty cool.

[ekstroemtj]

Great great. Thankx a lot

[ekstroemtj]

I found onother troublemaker . Jesus what a car.

Secondary radiator fan doesnt start. Germany now very hot and i was in a traffic jam today. Temp gauge is climbing and climbing. I open the hood. Nothing. What i hear and see, only one fan is running.

Checked the fuses at home. Everything fine. Any idea how to make a quick check what it can be?

[wrinkledpants]

Was the AC on?

[ekstroemtj]

It was on yes but when temp got up like crazy i switched off and change to heating. I remember thats cooling down a bit

[bigbuzuki]

What was your outside temp?

How high did your temp needle go?

[ekstroemtj]

Outside temp was arround 95 . The temp gauge needle went very close to the red mark

[ekstroemtj]

I would say the needle was at 100

[JFP in PA]

If you have access to the Durametric software, you can switch the fans on and off to test them. You may have a bad relay or a blown resistor on one fan.

[ekstroemtj]

Great! I will check.

Resistor is sitting on the fan? They trade with the fan or i can get it seperate if the part

Is faulty?

[wrinkledpants]

Yes, they should both be spinning when you turn the AC on. You probably have a bad fan as they do fail.

[ekstroemtj]

Yes, they should both be spinning when you turn the AC on. You probably have a bad fan as they do fail.

hi , i guess you got me wrong. i would like to know if the fan /resistor is one part or i can get it separate?

thank you

[wrinkledpants]

I think the bigger fan is an all-in-one type of unit where the controller is built into the fan. The smaller fan has an external controller (right next to it), but I'm pretty sure it's not a separate part that you can buy.

In my experience, the controllers don't often fail unless the fan has failed. When the fan starts to go bad, it can burn out the controller in the process. But, some cars have controllers that sense this, and they shut down the fan before that happens. I'm not sure how it works on the cayenne if it has the ability to do that, but it doesn't really matter since the controller comes with the fan. On some cars, the controller is a separate part that can be purchased on its own.

My guess is the fan needs to be replaced as they do go bad over time. Grab a blade of the bad fan, and wiggle it around. It shouldn't have any play in the bearing. If it does, it's probably bad. I can't really see any other parts that would cause it to go bad since the fans get their commands right from the ECU. The only other thing I could think of would be a chaffed wire somewhere in the harness. But, that seems like a distant possibility compared to the theory that the fan simply failed. Since the fan and controller are one part, it does make solving this problem a lot easier :)

[JFP in PA]

Yes, they should both be spinning when you turn the AC on. You probably have a bad fan as they do fail.

hi , i guess you got me wrong. i would like to know if the fan /resistor is one part or i can get it separate?

thank you

It varied with the model year, but the ones with resistors external to the fan controller could be replaced separately, but they are pricey (around $100 per).

[ekstroemtj]

Thank you guys for all your comments. I will try to check. I should have choosen a car mechanic profession instead of banking business. Would be much more useful if you drive cayennes.

[ekstroemtj]

Final Diagnose: main fan is faulty.

[ekstroemtj]

Please can somebody give me a hint what is the correcr part number for the big radiator fan.

I understand there are 3 numbers.

The full assembly with 2 fans and housing

The small fan

The big fan

Thank you

[Loren]

PM me your VIN and I will look up your exact fit part.

[Loren]

For your 2005 Cayenne...

Large fan -- 955 624 135 00

Small fan -- 955 624 134 01 (this is an updated part that should directly replace the old one)