Cleaning evaporator in front heater and air conditioning unit — AUDI

Cleaning evaporator in front heater and air conditioning unit
Note
The air conditioning for the Audi Q7 is available in different versions, depending on the vehicle equipment. Check the correct version and compatibility of the different components
Chapter
and
Electronic parts catalogue
.
At present, the evaporator in the rear heater and air conditioning unit (only fitted on vehicles with a
“High”
air conditioner) can only be cleaned with the
ultrasonic A/C cleaner
VAS 6189
when installed. The evaporator is installed beneath the centre console and is only accessible after removing certain components
Chapter
“
Removing and installing
rear fresh air blower
V80
”
. On this vehicle, the air emerging from the rear heater and air conditioning unit is drawn in either by the front heater and air conditioning unit or under the centre console depending on the setting on the
front air conditioner operating and display unit
E87
,
rear Climatronic operating and display unit
E265
and the ambient conditions. The air emerging from the front heater and air conditioning unit is first routed through the dust and pollen filter and the evaporator in the front heater and air conditioning unit. As the dust particles contained in the air are already separated in this process, they cannot be transported to the evaporator in the rear heater and air conditioning unit.
To clean the evaporator in the rear heater and air conditioning unit with the
ultrasonic A/C cleaner
VAS 6189
, set the air distribution at the front heater and air conditioning unit such that the majority of the air is conveyed to the rear heater and air conditioning unit and then clean the evaporator in the manner described for the evaporator in the front heater and air conditioning unit (in air recirculation mode, the air and vaporised cleaning agent are drawn in at the front and routed to the rear heater and air conditioning unit). If the rear heater and air conditioning unit is set to recirculation mode, it may be necessary to change the settings on the air conditioner (on
E265
) so that air is drawn from the front heater and air conditioning unit.
In air recirculation mode, the
rear fresh air blower
V80
installed in the rear heater and air conditioning unit draws in the air beneath the centre console in the area of the front seats. In the event of an odour nuisance in the rear heater and air conditioning unit, the centre console and the area beneath the front seats should therefore be checked for moisture and contamination, as well as checking the condensation drains in the rear heater and air conditioning unit for blockage and the heat exchanger fitted in the rear air conditioning unit for leaks
Chapter
“
Checking condensation drain hose
”
and
Chapter
“
Overview of fitting locations - control motors at rear
”
.