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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 EXPANSION VALVE AND RECEIVER/DRYER, WITHOUT REGULATED A/C COMPRESSORCHECKING
2012 Volkswagen Jetta TDI, 4D Sedan, Standard Trans

Checking With Expansion Valve And Receiver/Dryer, Without Regulated A/C Compressor: Checking

2012 Volkswagen Jetta TDI, 4D Sedan, Standard TransSECTION Checking
WARNING: This page is about a different car, the 2016 Volkswagen Beetle, 2015 Volkswagen Beetle, 2014 Volkswagen Beetle, and 2013 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

-- Turn off the ignition.

-- Connect pressure gauge battery (A/C service station).

-- Take pressure gauge readings. There are two possible results A and B.

Ambient Temperature in Degrees Celsius (Fahrenheit) Pressure in Refrigerant Circuit in Bar (psi) Positive Pressure
15 °C (60 °F) 3.9 (57 psi)
20 °C (68 °F) 4.7 (68 psi)
30 °C (86 °F) 6.7 (97 psi)
40 °C (104 °F) 9.1 (132 psi)
  • A- The pressure in the refrigerant circuit is lower than the pressure specified in the table. There is not enough refrigerant in the circuit.

- Search for leak with leak detection device.

- The pressure release valve is open, check coolant fan activation according to the wiring diagram.

Check refrigerant pipes and hoses to see if they are bent too sharply (cross-section constrictions) or have external damage. If no malfunction is found, flush refrigerant circuit.

  • B - The pressure in the refrigerant circuit matches the table or is higher.

-- Start the engine.

-- Set A/C system to maximum cooling output.

-- Open doors.

-- Open vents in instrument panel.

The A/C compressor is driven by the engine via the magnetic clutch using the ribbed belt.

NOTE:

If the A/C compressor is not driven, check A/C Clutch -N25- voltage supply.

If the voltage supply is OK, repair the magnetic clutch.

If the A/C compressor is driven, check refrigerant circuit:

-- Bring engine speed up to 2000 RPM.

-- Observe manometer battery:

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.