87 Audi 5000 heater/airconditioner problem

My 87 Audi 5000 heater/airconditioner suddenly only works in the
lowest temparature position.

When pushing the temperature control buttons on the dashboard,
there is no response. The screen only shows: the letters "low"

My question:

Could this be the control unit (with the buttons on the dashboard)?

Or.

a thermostat, bad connection, etc. ?

Any ideas?

Sure you are not talking about a '97 rather than '87 ?

The '87 didn't have an alpha display, just LED indicators by the buttons.

Audi climate control system are rather complex so it could be a number of things
.. Most likely a problem in the controller (under dash) or the programmer (on
dash). Could also be wiring connections like a bad ground.

Marti wrote:

> My 87 Audi 5000 heater/airconditioner suddenly only works in the
> lowest temparature position.
>
> When pushing the temperature control buttons on the dashboard,
> there is no response. The screen only shows: the letters "low"
>
> My question:
>
> Could this be the control unit (with the buttons on the dashboard)?
>
> Or.
>
> a thermostat, bad connection, etc. ?
>
> Any ideas?