How to replace audi a6 3.2 climate control

It most likely has to be reprogrammed. The tech should be able to program only the A/C control unit.

the heater core is removable from the climate control unit. The climate contriol unit has to be removed to replace it. The A/C system must be evacuated and lines removed as well as the dash, to access the climate control unit. The steam is coming from a leaking heater core.

All 3 are possible problems. A fuse is most likely the problem unless something got spilled leaked its way into the unit. Check all the fuses with a test light first before you try and replace the unit

It's probably not the fuse, if it was both sides wouldn't work. It sounds to me like it's the knob that's become disconnected or broken. You'll need to remove the head unit and troubleshoot. Please add year, and model, trim and I might be able to point you in the right direction to troubleshoot.

It sounds like one of 2 things happened:
1. You blew a fuse, be sure to check the fuse panel
2. You knocked the power block to the climate control system loose. Check that the power block leading to the climate controll is tight into the control unit

This is normally one of 3 problems:

1 - Refriant too low
2 - Pressure sensor faulty
3 - Climate Control Unit faulty

In order of cost -

1 - Re gas approx 49 pounds
2 - New sensor - 50 Pounds
3 - New climate control unit circa 700 pound

I have just had the same issue and after a re gas and new sensor it all works okay.

You need to replace the climate control display unit..

Nope - once you have the trim panel off and can unbolt the CC head unit, just slide it out, unplug the connectors, plug in the new unit, and reassemble. Nothing more to it than that - no diagnostics, codes, or setup needed.

You have to remove the trim panel around the stereo/climate control to expose the screws that hold it in place. Once you do that, and the screws are removed, it pulls straight out and unplugs. No need to disconnect the battery and no tricks to it once it slides out.

check the switch to turn on the air. it might be loose.