Bosch ACS 651 Originalbetriebsanleitung Seite 107

6.11 Hose drain
Every time a vehicle A/C service is performed, it is nec-
essary to drain the refrigerant from the hoses.
1. In the main menu, select "Vehicle A/C Service" and
press E.
2. Select the operator name and press E.
3. Select "Additional Services" → "Hose Drain". Press E.
 The Hose Drain screen is displayed.
Warning - Risk of frostbite!
If refrigerant escapes, there is a risk of frost-
bite to the hands and body.
¶
Carefully disconnect filling hoses as all
hoses can contain pressurized refrigerant.
4. Turn the quick couplers in the counterclockwise
direction and detach the HP/LP couplers from the
service connections on the vehicle.
5. Press  to select "Start hose drain". To abort the
hose drain, press c.
"
The hose drain starts.
Robert Bosch GmbH
Program description | ACS 651/751 | 107
6.12 A/C performance test
The A/C performance test can be conducted to check
for effective cooling of the vehicle A/C system. The
diagnosis can be done before or after vehicle A/C ser-
vice. However, there could be a risk of change in the
of R134a quantity in the vehicle A/C system by a small
amount.
1. In the main menu, select "Vehicle A/C Service" and
press E.
2. Select the operator name and press E.
3. Select "Additional Services" → "A/C Performance
Test".
4. Press E.
 The following screen is displayed.
5. Wait till the clearing is complete. Then, connect the
HP and LP service hoses to the service connections
on the vehicle A/C system. Press .
6. Start the engine with the vehicle gear lever turned to
Neutral.
7. Switch on the vehicle A/C to Maximum (cooling to
maximum). Press .
8. Perform the A/C system test based on either of the
following as per the A/C or vehicle manufacturer's
recommendation:
$
Grill temperature
$
HP and LP pressure gauge readings
9. After the A/C system test is complete, turn off the
engine and the vehicle A/C system. Press .
10. Wait for two minutes.
 The Hose Drain screen is displayed.
Warning - Risk of frostbite!
If refrigerant escapes, there is a risk of frost-
bite to the hands and body.
¶
Carefully disconnect filling hoses as all
hoses can contain pressurized refrigerant.
11. Turn the quick couplers in the counterclockwise
direction and detach the HP/LP couplers from the
service connections on the vehicle. Press .
12. Press  to select "Start hose drain". To abort the
hose drain, press c.
 The hose drain starts.
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1 689 988 238 2012-11-06