Volkswagen Polo Service & Repair Manual: Pressures, Checking
Note
Check cooling performance. The A/C system is functioning
correctly when the air flowing from the instrument panel vents
has a temperature of 70C or lower. |
Setting on Climatronic “LO”. |
Setting on A/C system “AC” on; “max”; “cold”. |
Connections with valve and service connections for measuring
and checking. |
– |
Connecting service station. Refer to
→ Chapter „Connecting Service Station“. |
– |
Take pressure gauge readings (two possible results). |
|
|
|
Ambient
Temperature in °C (°F) |
Pressure in
Refrigerant Circuit in bar (psi) Positive Pressure |
15 (59) |
3.9 (56.57) |
20 (68) |
4.7 (68.17) |
25 (77) |
5.6 (81.22) |
30 (86) |
6.7 (97.18) |
35 (95) |
7.8 (113.13) |
40 (104)
|
9.1 (131.98) |
45 (113) |
10.5 (152.28) |
Note
Temperature of refrigerant circuit components should be
equal to ambient temperature. |
Pressure will deviate from values in table if individual
components of refrigerant circuit are warmer or colder. |
At absolute pressure, 0 bar/psi corresponds to absolute
vacuum. Normal ambient pressure (positive pressure) corresponds
to 1 bar (14.5 psi) absolute pressure. 0 bar/psi pressure
corresponds to an absolute pressure of 1 bar (14.5 psi) on most
pressure gauges (indicated by 1 bar (14.5 psi) below 0). |
On vehicles with High Pressure Sensor -G65- with which the
measured pressure is displayed in the measured value block, the
measured pressure should correspond to the values in the table. |
The refrigerant circuit pressure is lower than indicated in
table |
Not enough refrigerant in refrigerant circuit |
– |
Determine refrigerant circuit leaks. Refer to
→ Chapter „Refrigerant Circuit, Tracing Leaks, with Electronic
Leak Detector -VAG1796-“. |
– |
Check the pressure relief valve. |
If pressure relief valve has responded: |
– |
Check the coolant fan activation. |
– |
Check refrigerant lines and hoses for cross-section
constrictions caused by inadequate bending radii. |
– |
Check refrigerant pipes and hoses for external damage. |
– |
If no malfunction is found, flush refrigerant circuit with
compressed air and nitrogen. |
The refrigerant circuit pressure is in line with table or is
higher |
– |
For vehicles with an electrically-driven A/C compressor,
switch on the ignition. |
WARNING
Hybrid vehicles have a high voltage system. Danger
of electrical shock! Inspect the high voltage components
visually before beginning. Follow the General Warnings.
Refer to
→ Hybrid Electric Equipment; Rep. Gr.93. |
|
– |
Set the A/C system to maximum cooling output. |
Note
If the low pressure switch was removed to connect the
service station, bridge the electrical connections in the
corresponding connector for the pressure measurement. |
A/C compressor is driven by the engine via A/C Clutch -N25-. |
The A/C Compressor Regulator Valve -N280- is activated by
the Climatronic Control Module -J255-. |
If A/C compressor is not driven with the engine running or
regulating valve is not actuated: |
– |
Determine and eliminate cause e.g. by checking air
conditioner DTC memory. |
– |
Observe test conditions. |
– |
Check the A/C Clutch -N25- voltage supply. If it is OK,
repair the A/C clutch. |
– |
Check activation of A/C Compressor Regulator Valve -N280-. |
|
Note
Check cooling performance. The A/C system is functioning
correctly when the air flowing from the instrument panel vents
has a temperature of ...
Note
Check cooling performance. The A/C system is functioning
correctly when the air flowing from the instrument panel vents
has a temperature of ...
Other materials:
Tire Pressure Monitoring Sensor without Valve, Removing and Installing,
Vehicle Before Customer Delivery
Special tools and workshop equipment
required
Torque Wrench -VAG1410-
Perform the Following:
Removing
–
Remove the tire from the disc wheel.
&nb ...
Cleaning seat belts
First read and observe the introductory information
and safety warningsLarge particles of dirt on the automatic belt prevent
it from rolling back properly and thus from working effectively.
The seat belts must never be removed for cleaning purposes.
Remove dirt with a soft brush .
C ...
Roll-back function for the electric windows
First read and observe the introductory information
and safety warnings
The roll-back function for the electric windows can reduce the risk of injuries
when the windows are closing . If the one-touch closing function for a window does
not work because it is stiff or is being obstructed, the w ...
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