2003 Volkswagen Passat W8 Questions

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On start up everything works fine but when the engine reaches normal temperature the fans kick in to high speed and remains running at high speed but temperature is rock steady. The fan runs on after the ignition is turned of for about 2 to 3 minutes.Could this be one of the sensors or the sensor in the thermostat housing. Can I check the sensors with a multimeter and if so is there a specific resistance value they should measure.
Thanks Michael.
problem diagnosed at three shops- all coming up with same code indicating catalytic 2. Know it will be labor intensive- just what is procedure for it's replacement?
I did do electronic check they cleared the error it drives but when I drive on high spread when I brake it goes back in safe mode again.when its about to come to a coplete hault it gives a grinding sound on front wheels
My w8 has stock hid lights, well I replaced the ballast and it worked for two sec then the fuse blew and so did the new ballast. Now I'm stuck iv spend 500$ on not the problem and now I need to know what to do?! Bc the passenger side lights works but nothing on the driver side dose.
2003 vw passat, w8, 4.0 liter, 32valve
pictures would go a long way
2003 VW Passat; W8 4.0liter, 16 valve
My mechanic told me that it'll cost eleven hundrend US dollars to fix the right rear window for my Passat W8. He said that the motor needs to be replaced. Does it really cost that much?

I'd appreciate your help.
The tank is not full
Everything electrical stopped working on my daughters W8. Windows, powere locks, etc. What causes this and is it going to be an expensive fix?
I am located in Melbourne, Australia, and my W8 Passat has done 142,000km. It has just had the original battery replaced, but upon replacement, the electrical system no longer functioned properly. The rear vision mirrors, central locking, power windows, etc. no longer worked. The VW service people told me that the control unit under the passenger side floor had possibly been water affected. Can I access this myself, under the carpet, or is access possible only from under the car?

I have opened the control unit in the boot, which had water in it, cleaned it up with a toothbrush and dried it out. The central locking, air conditioning and rear vision mirrors are now working. The fuel gauge, however, is not, and the trip gauge is registering odd numbers (actually going backwards). Can you please tell me which functions are controlled by the unit under the floor and which are controlled by the unit in the boot?

The car is due to be returned to the VW service centre soon, so that they can continue to try and remedy the problems, but in view of my success with drying out the control unit in the boot, I would like to have a go at resolving the other problems myself.
Does the dealer have to change it or can I
I am looking at buying an 03 Passat W8 w/95,000 miles & 1 owner car. It is very clean and have had it inspected all checks out. I plan on getting an extended warranty if I purchase. I like the car but am afraid it wind up being a money pit since they do not make this car anymore. The closest dealership to where I live is 1 1/2hrs away so I cannot run it to the dealer all the time for issues. I want a reliable nice used VW. Any input would be greatly appreciated.
My dealer told me that my Passat w8 with 56,000 miles needs a new thermostat and to replace the thermostat the engine has to be removed and it will cost $1200. Repair Pal says it should cost 3 to 4 hundred. Who is right?
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