HVAC possessed, no air

[987_RDC]

My HVAC attempts to move the fan speed up and down on its own and the Frost button doesn't function. No air comes out of the vents on any settings.

I think this started when I was holding the convertible button and tried to turn on the AC at same time. Ever since then its just going bonkers.

2002 Cabriolet.

Edited August 28, 2012 by 987_RDC

[1schoir]

One easy possible solution to the problem that you describe can is to remove the HVAC unit from the console and unplug it.

Then, look in the back of the unit at the small pins onto which the connector was plugged in. Inspect for any corrosion, which will look like fine white powder-like deposits on the pins. Clean off any corrosion and do the same to the female connector receptacles at the end of the connector.

I had a similar issue a couple of years ago, and that was the cause for me. Cleaning the corrosion off with emery cloth did the trick.

Regards, Maurice.

[987_RDC]

Will do! Any special instructions on how to get the HVAC out?

[1schoir]

Will do! Any special instructions on how to get the HVAC out?

Here is a comprehensive DIY on how to access all of the components in the console: http://www.renntech.org/forums/index.php/tutorials/article/242-mp3-player-through-cr-210-with-cd-changer/

Use the pertinent sections to help you understand how to remove the HVAC unit.

Another note...Sometimes, when there are unexplainable electrical gremlins, it turns out to be the electrical portion of the ignition switch. Your symptoms sound different, but keep that in mind nonetheless.

Regards, Maurice.

[987_RDC]

Another note...Sometimes, when there are unexplainable electrical gremlins, it turns out to be the electrical portion of the ignition switch. Your symptoms sound different, but keep that in mind nonetheless.

Regards, Maurice.

Crap. Not what I wanted to hear. My car started on its own around the same time. The ignition seems to be "gummed up" like it wants to always turn to the right. I have to force it to get key out. Anyway to clean that?

[1schoir]

Cleaning the ignition switch usually does not produce any results, but if you want to try that route stick one of those red "straws" that go on the end of a spray can into the cylinder and spray away. You can use a can of electrical contact cleaner.

If that does not yield any improvements, you will have to replace the ignition switch. If you are not getting that familiar "clunk" sound when you remove the key, that is usually a sign that the switch is on the way out. The good news is that it's an inexpensive part and fairly easy to remove and replace (if you are a contortionist :blush: .

Here's is a link to a DIY on the ignition switch: https://sites.google.com/site/mikefocke2/ignitionswitchreplacement

Regards, Maurice.

[987_RDC]

Thanks again. Seems that needs to be replaced.Audi part # 4A0 905 849 B cool, only $9 amazon prime.

[987_RDC]

Confirming the ignition switch did the trick to fix HVAC issue. (also crappy feel of ignition turn)

I used the finger grip sockets from Craftsman #00943401000

I did have to use a bench gringer on a tiny standard screwdriver bit to shave it down to approx 3mm so it would fit into the tiny holes of the two screws. (after chipping off red paint w/ larger driver)

[1schoir]

:clapping:

Thanks for sharing the solution. It should prove helpful to someone else who comes along with the same symptoms.

Those little fingergrip socket adapters look like a "must-have" for any tool box!

Regards, Maurice.