STAR TekInfo

STI Home

Body And Accessories

Chassis & Drivetrain

Engines

Diagnostic Manual, Climate Control, Volume 1

Printable version

LOCATION:

3.7 Air Conditioning (A/C) > 32 Pneumatic Test Program - Test

Pneumatic Test Program - Test

Preparation for Test

1. Review

11 ,

12 ,

14 ,

15 ,

20 ,

21 ,

31 ,

32 ,

41

2. Disconnect all vacuum lines at vacuum distributor block (36).

3. Check gray vacuum line to intake manifold for leaks.

Note:
Permissible leakage of the elements with vacuum lines at 400 mbar vacuum per minute is 30 mbar.

Test equipment; See MBUSA Standard Service Equipment Program

Description Brand, model, etc.

Connector 124 805 04 44

A. Vacuum Distributor Block, Vakuum Reservoir, Switchover Valve Block (Y11/3) Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy

1.0 Entire vacuum distributor block Connection "P" on vacuum tester. Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute
Vacuum distributor block,
1.1

1.1 Vacuum distributor block,
check valve "a" Connection "1" on vacuum tester. Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute
Vacuum distributor block,
1.2

1.2 Vacuum distributor block,
check valve "b" Connection "4" on vacuum tester. Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute
Vacuum distributor block.

2.0 Vacuum reservoir with
vacuum line Red/gray vacuum line (connection 3) on vacuum tester. Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute
Vacuum lines,
Vacuum reservoir.

3.0 Switchover valve
block (Y11/3) Ignition: OFF
medium green line (connection 5) on vacuum tester. Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute
Vacuum line,
Y11/3.

B. Vacuum system Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy

1.0 Defroster flap vacuum actuator, long stroke Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute. Vacuum line,
Vacuum actuator 38

1.1 Defroster flap vacuum actuator, short and long stroke Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute. Vacuum line,
Vacuum actuator 38

2.0 Diverter valve flap
center vent Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Temperature selector " "
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute. Vacuum line,
Vacuum actuator 41

3.0 Blend air flap
center vent Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Evacuate with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute. Vacuum line,
Vacuum actuator 45 and 46

4.0 Footwell flap, long stroke Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute. Vacuum line,
Vacuum actuator 39

4.1 Footwell flap vacuum element, long and short stroke. Medium green line (connection 5) on vacuum tester. Ignition: ON
Press
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute.
Vacuum line,
Vacuum actuator 39

5.0 Fresh/recirculating air flap vacuum element, long stroke. Medium green line (connection 5) on vacuum tester. Ignition: ON
Illuminates
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute.
Vacuum line,
Vacuum actuator 44

5.1 Fresh/recirculating air flap vacuum element, short and long stroke. Medium green line (connection 5) on vacuum tester. Ignition: ON
Illuminates
Evacuate system with
300 mbar vacuum. 30 mbar
pressure
increase in
1 minute.
Vacuum line,
Vacuum actuator 44