Flushing The Vehicle A/C System; Refrigerant Top-Up - Bosch ACS 651 Original Instructions Manual

en 106 | ACS 651/751 | Program description
6.9

Flushing the vehicle A/C system

Flushing is carried out to purge used compressor oil,
impurities or metallic particles from the vehicle A/C sys-
tem. The refrigerant, R134a, itself is used as the
medium for flushing.
!
Do not use any solvent for flushing. Using solvents
might damage the ACS 651/751.
The refrigerant in the vehicle A/C system must be
extracted before flushing. During cleaning, the refriger-
ant is injected into the vehicle A/C system using the HP
hose and is simultaneously extracted using the LP hose.
At the end of flushing, the residual oil is added to the
used oil reservoir.
!
The system components which cannot be flushed
should be removed from the flushing circuit. An inter-
mediate filter must always be used when flushing.
!
Before carrying out the flushing procedure, recover
the refrigerant from the vehicle A/C system.
1. Connect the quick couplers to the service connections
on the vehicle A/C system.
2. Disconnect the following system components from the
refrigerant circuit of the vehicle A/C circuit:
$
Compressor
$
Line filter
$
Fixed choke
$
Collection containers
$
Filter drying units
$
Expansion valve
3. Connect the quick couplers and the components
that need to be flushed using special adapters.
4. In the main menu, select "Vehicle A/C Service" and
press E.
5. Select the operator name and press E.
6. Select "A/C System Flushing" and press E.
7. Select the required mode of flushing and press E.
8. Enter the vehicle ID and Press E.
i
Performing extended flushing is equivalent to perform-
ing short flushing thrice.
9. Press E.
 The flushing process starts.
10. To cancel the flushing, press c. After the flushing
is complete, disconnect the quick couplers and the
components from the special adapters.
11. Connect the components listed in step 2 back to
the vehicle A/C system.
12. In the manual mode, perform vacuum creation and
refill refrigerant into the vehicle A/C system.(See
chapter 6.7)
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1 689 988 238 2012-11-06
6.10

Refrigerant top-up

i
This option is available only for ACS 651.
The vehicle A/C system requires a specific quantity of
refrigerant to perform the cooling effectively.
a decrease in the quantity of refrigerant in the vehicle
A/C system due to a leak or because of other reasons,
an additional quantity needs to be added or "topped
up".
1. In the main menu, select "Vehicle A/C Service" and
press E.
2. Select the operator name and press E.
3. Select "Refrigerant Top Up" and press E.
4. Connect the appropriate coupler to the service con-
nection on the vehicle A/C system and press .
5. Start the vehicle and switch on the A/C. Press .
6. Enter the quantity of refrigerant to be topped up.
Press .
i
The valid top up quantity range is between 20 and
100 grams.
7. Select "Start Top Up" and press . To abort the top-
up process, press c.
 The refrigerant top-up starts. After the top-up is
complete, the summary screen is displayed.

8. Press to print the service report.
"
You have successfully topped up the refrigerant in the
vehicle.
If there is
Robert Bosch GmbH