Volkswagen Polo Service & Repair Manual: Checking

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Pressures, Checking / Checking with Expansion Valve and Receiver/Dryer, without Regulated A/C Compressor / Checking

–	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 °C (°F)	Pressure in Refrigerant Circuit in Bar (psi) Positive Pressure
15 (60)	3.9 (57)
20 (68)	4.7 (68)
30 (86)	6.7 (97)
40 (104)	9.1 (132)

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:

Specified Values

High-pressure side:

Increasing from pressure with engine not running to a maximum of 20 bar (290 psi).

Low-pressure side:

Decreasing from pressure with engine not running down to 1.3 bar (18.9 psi).

Test Requirements

Radiator and condenser are clean (clean if necessary). The ribbed belt for the A/C compressor and alternator tensioned correctly. ...

Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor

Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements ...

Other materials:

Checking with Expansion Valve, Receiver/Dryer and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
Specified Values Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „P ...

Decorative Trims, Replacing, Bolted Decorative Trims
These disc wheels are equipped with replaceable decoration elements. Note the following when installing. – Clean the thread in the disc wheel before screwing in the new bolts. ...

Introduction
This chapter contains information on the following subjects: → Operating ParkPilot → Acoustic and optical ParkPilot signals at the rear of the vehicle The ParkPilot assists the driver when manoeuvring and parking. The ultrasound sensors in the rear bumper transmit and recei ...