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HOMESERVICE MANUALSVOLKSWAGEN2012JETTA TDI, 4D SEDAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 53 (REFRIGERANT R134A SERVICING (CONVERTIBLE))00 GENERAL, TECHNICAL DATAPRESSURES, CHECKINGCHECKING WITH RESTRICTOR AND RESERVOIR, WITH INTERNALLY REGULATED A/C COMPRESSORSPECIFIED VALUES
2012 Volkswagen Jetta TDI, 4D Sedan, Standard Trans

Specified Values

2012 Volkswagen Jetta TDI, 4D Sedan, Standard TransSECTION Specified Values
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High-pressure side:

Increasing from initial pressure (when connecting the pressure gauges) to a maximum of 20 bar.

Low-pressure side:

Decreasing from initial pressure (when connecting pressure gauges) to the value in the graph.

Fig 1: Identifying Permissible Tolerance Range Graph
GWWA87-0006Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

A -

High pressure (measured at service connection) in bar

B -

Low pressure (measured at connection with valve at compressor or accumulator) in bar.

C -

Permissible tolerance range

D -

Low pressure (measured at connection with valve for low-pressure switch or at service connection) in bar

E -

Permissible tolerance range

Possible deviation from specification Possible cause of fault Corrective action
  • High pressure remains constant or increases only slightly (above pressure with engine stopped),
  • Low pressure quickly drops to value in graph or below
  • Required cooling output is not attained
 Not enough refrigerant in refrigerant circuit -- Check for leaks and correct.-- Charge the refrigerant circuit.
  • High pressure normal
  • Low pressure in line with value in graph
  • Required cooling output is not attained
    
  • High pressure normal
  • Low pressure too low (see graph)
  • Required cooling output is not attained
    
NOTE:

If no malfunction is found with this complaint, flush (clean) refrigerant circuit with refrigerant R134a, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A . If that is not possible in this workshop, flush the refrigerant circuit with compressed air and remove moisture with nitrogen, refer to REFRIGERANT CIRCUIT, FLUSHING WITH COMPRESSED AIR AND NITROGEN .

Possible deviation from specification Possible cause of fault Corrective action
  • High pressure only increases slightly above pressure with engine stopped
  • Low pressure drops only slightly
  • Required cooling output is not attained
 A/C compressor faulty. -- Flush (clean) refrigerant circuit, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A .-- Replace A/C compressor.
Possible deviation from specification Possible cause of fault Corrective action
  • High pressure increases above specification
  • Low pressure quickly drops to value in graph or below
  • Required cooling output is not attained
 Constriction or obstruction in refrigerant circuit -- Run hand over refrigerant circuit to check for differences in temperature
  • If difference in temperature is found at one component:
-- Replace the hose or pipe if kinked or constricted.-- In the event of an obstruction, flush refrigerant circuit with compressed air and nitrogen-- Repeat test if function is not OK.-- Flush (clean) refrigerant circuit, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A .
  • High and low pressure normal at first After some time,
  • high pressure increases above specification
  • Low pressure quickly drops to value in graph or below,
  • Required cooling output is no longer attained.
 Moisture in refrigerant circuit -- Flush refrigerant circuit with compressed air and nitrogen.-- Replace receiver/dryer.-- Repeat test if function is not OK.-- Flush (clean) refrigerant circuit, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A .-- Charge the refrigerant circuit.-- Repeat the test.
  • High pressure normal
  • Low pressure too low (see graph)
  • The required cooling performance is obtained
 A/C compressor faulty. -- Flush (clean) refrigerant circuit, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A .-- Replace A/C compressor.
NOTE:

For the malfunction "high pressure normal, low pressure too low", note the following:

This fault may cause the evaporator to ice up or the A/C Refrigerant Low Pressure Switch -F73- to shut off the compressor although the amount of refrigerant in the circuit is OK.

Possible deviation from specification Possible cause of fault Corrective action
  • High pressure normal or too high
  • Low pressure too high (see graph)
  • A/C compressor noise (particularly after switch-on)
  • Required cooling output is not attained
 Too much refrigerant in the circuit. -- Extract refrigerant from the refrigerant circuit
  • If quantity of refrigerant extracted roughly corresponds to specified capacity:
-- Replace the A/C compressor.
  • If quantity of refrigerant extracted is substantially greater than specified capacity:
-- Charge the refrigerant circuit.-- Repeat the test.
Possible deviation from specification Possible cause of fault Corrective action
  • High and low pressure normal
  • Required cooling output is not attained
 To much refrigerant oil in the circuit. -- Discharge the refrigerant circuit.-- Flush (clean) refrigerant circuit, refer to REFRIGERANT CIRCUIT, FLUSHING (CLEANING) WITH REFRIGERANT R134A .
  • High and low pressure normal
  • A/C compressor noise (particularly after switch-on)
  • The required cooling performance is obtained
    
NOTE:

Overfilling with refrigerant oil can occur in the event, for example, the compressor has been replaced without adjusting the quantity of refrigerant oil.

If the A/C compressor is not replaced, the refrigerant oil should be drained from the A/C compressor via the oil drain plug. Out of the entire quantity of refrigerant oil, 50 grams should be put in the A/C compressor and the rest in the refrigerant circuit.

RENDER: 1.0x

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