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

WARNING: This page is about a different car, the 2016 Volkswagen Beetle, 2015 Volkswagen Beetle, 2014 Volkswagen Beetle, 2013 Volkswagen Beetle, and 2012 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: