Audi B4: Retrofit Climate Control System.

Hello,

I want to convert the manual climate control in my B4 to automatic climate control. I already have the heater box with all the necessary actuators, and the wiring harness for the control unit. Besides the control unit itself, what else do I need for the conversion?

I am grateful for any advice or help. Perhaps someone has already done something similar before.

Vehicle:

Audi 80 B4.
1Z 90hp TDI
Bj.: 12/93
(Translation: Year of manufacture: 12/93)
170,000 km

Hello, you still need piping with pressure sensors, a compressor, a condenser, and a dryer.

Hello, you still need pipes with pressure sensors, a compressor, a condenser, and a dryer.

Yes, that's true, but shouldn't those features already be included in the standard air conditioning system? Or are they different with the automatic climate control?
Do climate control motors operate with negative pressure or positive pressure?

Oh, I see, you already have a manual climate control system, so you have everything you need.

I only have one more question: The control system also needs to be powered by a voltage.

Do you need a second wiring harness for this, one that connects to the board's electronics?

Does the VAG interface work for reading error codes?

Best regards, Kissenknicker.

It's probably not possible to read the data from the old climate control system.
It's best to get a wiring diagram so you can run the power cables yourself. Also, you'll be able to see what other components you might need (relays, temperature sensors, etc.).

Where can I find such a schematic diagram? Is there any information about it available online? Perhaps even here in this forum?

Best regards, Kissenknicker.

I'll take a look tomorrow.

Hello, I sent you the circuit diagram via email (it's about 3MB - you wanted to be able to see something on it), and I hope it helps you.

Hello, yes, I received it today. It looks pretty good.

Thank you very much!

No problem, just let me know if you have any issues.