Webasto auxiliary heater for 2.5 TDI AEL/AAT models with automatic climate control

Hi,

Has anyone ever installed a parking heater in the vehicle mentioned above?

My problem: Webasto says they don't have any vehicle-specific information about Audis before the year 2002 . This initially makes me concerned. I'm specifically interested in the electrical connection to the automatic climate control system, i.e. Fans.
Probably, you need to adjust the ventilation flaps to the desired position while the vehicle is still parked, right? Or is the blower controlled via a bus system?
Then it will become difficult.

If anyone else has a photo of where they got theirs, that would be great.

Best regards, Kai.

No problem. You can connect it in two ways: 1. you need to set the desired settings beforehand, or 2. it will automatically select 22°C and fan speed level 4.
It is connected to contacts D1 and D9.

Hi,

That was a bit too fast for me. The climate control system has approximately 8-12 settings. Of those, 4?
Or 4 for a manual climate control system?

Where are D1 and D9 located? Are they on the blower motor? I need a little more text I haven't really gotten into it or read it yet, and the Tele Thermo Top C is still at the dealer (but not for long) .
And what determines whether 'Automatic 22C' and 'Level 4' are selected?

Best regards, Kai.

kmrlange wrote:

The climate control system typically has around 8 to 12 settings. Of those, 4?

Yes, that's right. The climate control system has 12 settings, and it's currently set to level 4.

kmrlange wrote:

Where are D1 and D9 located? On the blower motor ?

No, on the control panel.

kmrlange wrote:

And what does it depend on whether "Automatic 22C" and level 4 are selected?

Regarding the type of connection. Tell me which version you want, and then I'll tell you how to connect it.

Hi,

Is that the control panel for the air conditioning? The one where I always spill my coffee? Please, could you write complete sentences? I had a long week.
Heating system version?
Or version of the connection type?

Yes, I would like to install the Tele Thermo Top C T100 HTM.
Yes, level 4 and 22C are okay.

Where are the control valves for the HVAC (Heating, Ventilation & Air Conditioning) located?
Top-middle-bottom? Or a car?

Best regards, kai.

kmrlange wrote:

On the control panel of the climate control system?

richitg

kmrlange wrote:

Or version of the connector type?

Okay. You've already given the answer.

kmrlange wrote:

Where are the control valves for the HVAC (Heating, Ventilation & Air Condition) located? Top, middle, or bottom? Or a car?

In car mode, if I'm not mistaken, the ventilation blows air from the top, bottom, and center as long as the temperature inside the car is not warmer than the temperature set on the control panel (which is typically the case in the summer). But I think you know that better, I've only had my climate control system for a week...

Okay, regarding the connection:
The fan receives its power through terminal X, which is only active when the ignition is on. To ensure it also runs during the auxiliary heating operation, the power supply line needs to be disconnected and connected to the switching relay (K3) of the auxiliary heater. Then, once the auxiliary heater is running, the connection will switch from terminal X to terminal 30.
Contact D9 supplies power to the control panel (climate control system). To achieve the 22°C setting, it must be ensured that the control panel only receives power when contact D9 is active, which means when the ignition is on and the auxiliary heater is not running. To achieve this, contact D9 is disconnected from the connector and isolated. Then, connect contact D9 with a new wire to the positive supply of the fan motor before the relay K3.
To ensure the control panel receives power even when the auxiliary heater is running, the contact D1 (powers the control panel and sets the temperature to 22°C, level 4) is connected to the wire from the auxiliary heater that activates the relay K3 (green/white).

And to make it a little more understandable:
[img][/img]

The plan is for an A4 size, so the cable colors probably won't match.
You don't need the K31 relay; the green and white wire of the Thermo Top C has sufficient switching power to directly supply the control panel.http://www.freitachnacht.de/KIlimaanlageA4_97.jpg{MARKER}

Hi,

Well, those are certainly not complete sentences . Sure, you're welcome.
A wiring diagram speaks volumes. Once you have that, the only thing left to do for the conversion is to find a suitable mounting location. Where did you tap into the fuel line? It's usually easiest to access things in the engine compartment.

Best regards, Kai.

No, definitely don't tap into the existing fuel tank; that will only cause problems. The best solution is to install your own fuel tank and filler neck. It doesn't cost much and it's not that much work.
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Bitte nutze 'Attachment hinzufügen' bzw. das Upload Forum hier.

Hi,
I didn't know that the fuel for the ESP is drawn from the fuel tank sensor .
Then it runs along under the rear seat and then reappears.
Is the undercarriage removed? Is that correct? I've never paid attention to that before.

Things get interesting underneath the car. It's a Quattro, so it's definitely reliable.
not much space, but it's supposed to be a challenge...
No space in the engine compartment, and it's going to be tight underneath the car...

[img][/img]
Here's a picture of the entire engine compartment. I'm mourning the loss of my Mercedes 240D...

Best regards, Kai.http://people.freenet.de/kmrlange/Webasto_MotRaum.JPG{MARKER}

kmrlange wrote:

I didn't know that the fuel for the ESP is drawn from the fuel tank sender .

Yes, that's correct.
It doesn't matter that it's a Quattro; the fuel line isn't routed through the driveshaft tunnel anyway. And the engine bay isn't that cramped either. For example, there's plenty of space next to the coolant reservoir. In addition, the vehicle originally came with a built-in auxiliary heater (although the Thermo Top C model didn't exist at that time), so there should be a place where one could be installed.

Here are some photos.

Thank you for the pictures.
I suspected as much... Well, then I'll go ahead and order the heating system.
Okay, so thank you again for the tips, wolfi_b and christians. I'll also take some photos and report back.

Best regards, Kai.

Hi,

I have now integrated the TT-C with HTM 100 to the extent that it is functional. Only the electrical system isn't working quite right yet.
(Of course not, I work in electronics development ).

The following problem:
Vehicle: Ignition off.
Activating the Webasto heater using the remote control causes the relay to switch, and the Webasto heater starts up completely.
Let's not do anything else for now. The ventilation system isn't turning on; only the lighting on the heating/climate control panel is blinking.
At a rate of once per second, the system sets the temperature to 22°C, and you can hear the control valves clicking in a blinking rhythm until they reach the automatic setting.
It looks like an attempt to restart the system using a cyclical V_LOW signal. Okay, so undervoltage always happens when...
more power is being drawn.

It seems the problem lies with the wiring. D1 and D9 are all as planned. The cable cross-sections are also fine.
I don't have a wiring diagram for the A6, only the one for the A4 (shown above). From the 30A fuse (for ventilation/air conditioning) in the...
A blue/green cable detaches from the side dashboard cover in the A6. I cut that part out and rewired it accordingly.
If I unplug the main connector 'D' from the climate control unit, the ventilation system blasts full force.
when the Webasto is in operation. It seems like there are some startup problems with the air conditioning system.

Does anyone have any ideas?

Best regards, kai.

I had a similar problem once, but it went away after a restart and hasn't come back since.
Sometimes I also have the problem that the lighting flickers a bit when the auxiliary heater is running. I suspect that the auxiliary heater is not able to provide the necessary power for the ignition. Try inserting a relay in between, as shown in the diagram above.

Hi,

I once measured the voltage at pins D1 and D9. It drops to a minimum of 11.5V.
That should definitely be enough. I'm exhibiting some really strange behavior.

As described (above), when the 30A fuse is installed. If I pull it out, it comes out.
The climate control is still not working, but it's set to the manually configured settings.
Enter a value such as '18C + ventilation upwards' instead of '22C + AUTO'. And if I then choose D9...
'When I measure it, I get exactly what I suspect, about 10V, and it always happens when the air conditioning is turned on.'
9.5V. And 9.5 V is a classic value for undervoltage behavior in electronics.

Can someone tell me if the blue/green cable is actually the output for the 30A circuit?
'Fuse?' Is there anything else that's different between the A6 and the A4?

Best regards, Kai.

Hello Wolfi_B,

I was a bit skeptical about the undervoltage behavior, but I decided to check the voltage of the input line to D1.
a second relay (located at the top, labeled K3.1). And behold --- It works!
Okay, 11.5V is definitely very low. Considering that radios stop producing audio output at voltages of 9.5V or higher, and still...
It must remain powered by up to 6V from the vehicle's bus system.

Well then - I wish you a Merry Christmas. Now it can be cold without any worries.

Best regards, Kai.