Volkswagen Golf Service & Repair Manual: Checking pressures
– |
Connecting air conditioner service station
→ Chapter. |
– |
Read pressure from pressure gauges; two results may be
displayed. |
|
|
|
Ambient
temperature (in degrees centigrade) |
Pressure in
the refrigerant circuit in bar positive pressure |
+15°C |
3.9 |
+20°C |
4.7 |
+25°C |
5.6 |
+30°C |
6.7 |
+35°C |
7.8 |
+40°C |
9.1 |
+45°C |
10.5 |
Note
The temperature of the components of the refrigerant circuit
should be the same as the ambient temperature. |
If individual components of the refrigerant circuit are
warmer or colder, then the pressure will deviate from the values
shown in the tables. |
Absolute pressure means that 0 bar corresponds to an
absolute vacuum. The normal ambient pressure (positive pressure)
corresponds to 1 bar absolute pressure. On most pressure gauges,
a reading of 0 bar corresponds to an absolute pressure of one
bar (which is confirmed by the existence of - 1 bar marking
beneath the 0 scale marking). |
Where vehicles have a high-pressure sender -G65- which
indicates the measured pressure in the measured values block,
the measured pressure should agree with the values in the
tables. |
The pressure in the refrigerant circuit is lower than
indicated in the table |
Insufficient refrigerant in circuit. |
– |
Check for leaks in the refrigerant circuit
→ Chapter. |
– |
Check the high-pressure safety valve. |
If the high-pressure safety valve has blown off: |
– |
Check activation of radiator fan. |
– |
Check refrigerant pipes and refrigerant hoses for
restrictions in cross-section at bends that have too tight
radius. |
– |
Check refrigerant pipes and refrigerant hoses for external
damage. |
– |
If no defects are found, blow through refrigerant circuit
with compressed air and nitrogen. |
The pressure in the refrigerant circuit is equal to or
greater than that in the table |
– |
On vehicles with electrical air conditioner compressor,
switch off ignition. |
WARNING
High voltage on high-voltage system of hybrid
vehicle. Danger of electric shock! Before starting work,
carry out a visual check of high-voltage components in
area of work. Comply with general warnings
→ Hybrid electrical system; Rep. gr.93. |
|
– |
Set air conditioning system for maximum cooling output. |
Note
If the low-pressure switch had been removed in order to
connect the air conditioner service station, bridge the
electrical connections in the respective connector for pressure
measurement. |
The air conditioner compressor is driven by the engine via
the air conditioning system magnetic clutch -N25-. |
The air conditioner compressor regulating valve -N280- is
activated by the Climatronic control unit -J255-. |
If the air conditioner compressor is not driven or the
regulating valve not activated when the engine is running: |
– |
Determine the cause, e.g. by reading the event memory for
the air conditioning system, and rectify it. |
– |
Observe the test prerequisites. |
– |
Check power supply for air conditioning system magnetic
clutch -N25-. If this is OK, repair magnetic clutch. |
– |
Check actuation of air conditioner compressor regulating
valve -N280-. |
|
|
|
Radiator and condenser must be clean (clean them if
necessary).
The heat insulation on expansion valve is OK and properly
installed. See ...
Where vehicles have a restrictor and reservoir, check these
(with internally regulated air conditioning system compressor)
→ Chapter.
...
Other materials:
If there is still refrigerant in the refrigerant circuit
Drain refrigerant circuit.
–
Remove defective part, purge with compressed air and collect
escaping refrigerant oil.
–
A quantity of fresh refrigerant oil equal to the quantity of
...
Removing and installing ESP sensor unit -G419-
The lateral acceleration sender -G200-, the yaw rate sender
-G202- and the longitudinal acceleration sender -G251- are
installed together with the control unit for electromechanical
parking brake -J540- in the ABS control unit -J104-.
Th ...
Assembly overview - rear brake caliper
When carrying out repairs, install all parts supplied in
repair kit.
Use only methylated spirits for cleaning the brake.
New brake calipers are filled with brake fluid and are
pre-bled.
...
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