MAHLE ACX1281, Operation Manual

© MAHLE 

22  |  ACX1281  |  Operation

en

6.6 

Automatic/manual vehicle A/C  

service overview

Phases

Aut

omatic mode

Manual

mode

Recover

y

V

acuum

Rechar

ge

Checking of air conditioner pressure

x

x

x

x

Extraction of refrigerant

x

x

–

–

Separation of oil from refrigerant

x

x

–

–

Formation of vacuum

x

x

x

–

Maintenance of vacuum

x

x

x

–

Addition of refrigerant

(test quantity 75g)

x

–

–

x

Extraction of refrigerant

(test quantity 75g)

x

–

–

x

Implementation of leak test

x

–

–

x

Pressure increase test

x

x

–

–

Drainage of oil into used oil bottle

x

x

–

–

Recharging refrigerant

x

–

–

x

Tab. 1: 

Automatic/manual mode overview 
x = is implemented

6.6.1  Recovery

t

The pressure in the vehicle air conditioning system is checked 
prior to the recovery phase. If the air conditioning system is 
depressurized (empty), operator can move to vacuum phase.

6.6.2  Vacuum

t

A vacuum is generated and maintained for at least 5 minutes.

t

Make sure recovery has been performed before generating 
the vacuum.

6.6.3  Charging with refrigerant

t

Service  phases:

  75g  test  fill,  leak  test,  extraction  of  75g 

test fill, pressure increase test, vacuum generation and final 
charging.

t

If pressure is detected in the vehicle air conditioning system 
during  charging,  recovery  must  be  performed  in  order  to 
continue.

6.7 

Flushing

6.7.1  Flushing after changing type of oil

m

When servicing a vehicle, the type of oil in the vehicle's A/C 
system  should  be  noted  to  prevent  a  cross-contamination 
inside the ACX1281. If a PAG system is serviced and another 
vehicle  with  a  POE  system  is  to  be  serviced  next,  a  flush 
routine must be performed to prevent a cross-contamination 
of the oils.

m

If the ACX1281 is not flushed, the internal hydraulic system 
and the vehicle air conditioning system could be damaged as 
a result of cross-contamination. MAHLE cannot accept liability 
for any such damage.

t

Enter the parameters for vacuum time and refrigerant quan-
tity.

1. 

Select "

Vehicle A/C Service

>>

A/C system flushing

>>

Short flushing

".

2. 

Follow the menu prompting.

t

The Short Flushing procedure is used to clear out the ACX1281 
hoses when changing oil types. The Extended Flushing pro-
cedure is used to perform liquid refrigerant flushing on A/C 
system components.

6.7.2  Flushing system components

m

Component to be flushed should be empty (no gas or other 
substance inside).

m

For maximum flush efficiency, connection shoul dbe made so 
that the refrigerant flow is opposite the normal direction of flow.

1. 

Power on ACX unit.

2. 

From  main  menu,  select  VEHICLE  A/C  SERVICE>> 
A/C SYSTEM FLUSHING>>EXTENDED FLUSHING.

3. 

After connections are completed as described in section 5.1 
of the Flush kit manual, and the flushing process has started, 
the process is fully automatic and just needs to be monitored 
by technician.

4. 

The flushing software includes multiple cycles that uses up to 
3kg (max) of refrigerant. Each cycle includes a vacuum leak 
test, a leak test under pressure using refrigerant and mulitple 
flushing cycles of injecting and recovering liquid refrigerant. 
A final vacuum is performed to dry the system prior to dis-
connecting.

t

Cycle times can vary in relation to the characteristics of the 
component or part of the A/C system being flushed.