Heater fan speed reduced after slave cylinder and flywheel were replaced?

Yep, it sounds like they left a ground wire off when the repair was done, I would take it back to them and have them recheck there work. Let me know how it goes.

The van was taken back to recheck the work. An auto electrician ran over it and I was told that changes in fan volume is a feature built into the Volkswagen. When reversing it switches to air recycling mode, so that fumes don't get sucked into the vehicle when reversing. And on my vehicle the recycle mode does cause the fans to spin faster.

The electrical humming, I hear after I turn the engine off, was proposed to be the fuel filter doing some final pumping (not sure why). Alternatively, it has been proposed there may be some electrical interference that would require additional investigation.

I am not sure I am completely satisfied by this humming explanation. But as it is not really affecting me, I have left it at that for now.

Okay, it does sound a little strange, do you have any warning lights on?

No warning lights are coming on, Ken.

I should also mention that the cruise control recently stopped working mid-drive and I wondered if it could be related electrically? Is there a sensor in the clutch pedal that that can prevent the cruise from working, the same pedal that contains the master cylinder.

Did this problem happen before the repair? If so, it will not be related, and we will need you to start a new thread. It still sounds like they left something off like a ground wire or an electrical connector is dirty or not plugged in completely. There is a ground G304 at the base of the right-side door pillar I would check, here is the blower motor wiring diagrams so you can see how the system works, if the ground is okay, we should do a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ



Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

I found a disconnected wire (photo attached).

Thanks for the electrical diagrams, I traced them and found my G304 ground near my pillar. The electrical diagram says G304 is "Base of right D Pillar". "D" means the rear pillar. I had attached 2 years ago additional wires to this ground: my house battery, inverter and dcdc charger. These all predate the problem with the fan speed and have all been working flawlessly for me for the past 2 years.

I have been researching which odb2 CAN scanner to buy so I can run some diagnostics for you. I am leaning towards a Bluetooth scanner, hopefully that supports CAN as well as has the ability to turn off the 'service due' indicator.

So how did I find a disconnected wire?

One week ago, I started hearing some rattling sounds whenever I drive. It's happening all the time but erratically. I imagine there is a tool or something loose in the engine, rolling around.

So, I took the bottom plastic shroud off and had a look. To my surprise, I found an electrical socket that looked like it should have something plugged into it. Then I found a cable not plugged in to anything. So, I have plugged them together and they fit well.

I am in disbelief at my mechanic. Even when I took it back to them and explained the problem, how could they miss this? I am pretty annoyed.

Do you know what this cable does?

Good find, it looks like the engine oil temperature and level sensor. After you plugged it in and fixed the ground did the blower operation return?