Hi All,

I drive '98 Audi A6 Quatro, V6, 5V, 2.8L. My climate control has a problem. I took apart dash and checked blower fan, it workes perfect - I took it off, connected to 12V source and Fan works fine.

I checked fuses and those 30 Amp( I guess they are for Climate Control) are good. I checked cables which connect to Blower Fan and they do not have POWER. My multimeter did not show anything - I guess this is the problem right? any ideas what is going on? I appreciate your help.

Additional Symptom - Sometimes when I turn on Climate Control the screen(s) on climate control Unit start blinking. Oh and I have Solar roof, if that info is any help.

WHAT I HAVE CHECKED :

I checked Fuse # 25(Blower for Heating, Climate Control, Solar roof) and Fuse#26(Air Circulation, Rear Window Defogger). When Ignition is ON they have Power


I need your help and will appreciate it highly.

Thank YOu

 

From what you're describing, it sounds like the transistor/resistor pack has failed. That's the component that decreases the voltage going to the blower motor when you want to run it at less than top speed. In the older days (like when we had 4 speeds to pick from), it was simply a series of resistors. Modern day, it's all transistor based.

It should be right next to your blower motor on the left-hand side. It's actually in the duct itself; it uses the airflow to keep itself cool. Look for a good-sized power connector that appears to run straight into the duct. On my 99 A4, there's one screw that holds it in place. I don't know how to test it by itself, but if it's obviously burned/damaged, you have your answer.

(funny side story: my old Volvo 850 had a ceramic resistor pack to control fan speed. I ended up getting a little bit of water in the system, and one fine day the water splashed just the wrong way on the screaming-hot reisistor pack. It made an impressive noise as it blew itself into 100 pieces!).

Good luck!
-Red

 

This one? I removed it any ideas how to test it?
THanks



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