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10 Checking pressures on vehicles
10.1 Checking pressures in refrigerant circuit
(using air conditioner service station)
Note
♦
Check the cooling performance. The air conditioning system
is operating correctly if the air emerging from the vent on the
dashboard is at a temperature of 7
o
C or less.
♦
Set the Climatronic to: “LO”.
♦
Set the air conditioning system: “AC” on; “max”; “cold”.
♦
Connections with valve and service connections for measuring
and testing.
10.1.1 Test prerequisites
• Radiator and condenser must be clean (clean them if neces‐
sary).
• The heat insulation on expansion valve is OK and properly
installed. See vehicle-specific repair manual ⇒ Rep. gr. 87 .
• The poly V-belt is OK and properly tensioned. The V-belt for
air conditioner compressor and alternator is in good condition
and correctly tensioned. See vehicle-specific repair manual ⇒
Rep. gr. 87
• All air ducts, covers and seals are OK and properly installed.
• Fault-finding on the electrical systems and vacuum system
has found no faults. See vehicle-specific repair manual ⇒ Rep.
gr. 87
• Self-diagnosis of the air conditioning system with the vehicle
diagnosis, testing and information system - VAS 5051A- using
“guided fault finding” cannot detect any faults; no switch-off
conditions for the air conditioner compressor are set in the
measured value block (only when the vehicle “air conditioning
system” is fitted with self-diagnosis).
• The passage of air through the dust and pollen filter is not im‐
paired by dirt. See vehicle-specific repair manual ⇒ Rep. gr.
87
• The heater and air conditioner does not draw any secondary
air at highest fresh air blower speed. The evaporator and heat‐
ing do not draw any uncooled air at highest fresh air blower
speed. See vehicle-specific repair manual ⇒ Rep. gr. 87
• The air duct flaps in the heater and air conditioner reach their
stop positions. See vehicle-specific repair manual ⇒ Rep. gr.
87
• The fresh air intake ducts under the bonnet and in the pas‐
senger compartment and their water drain valves are in good
condition. See vehicle-specific repair manual ⇒ Rep. gr. 87
• The engine is at operating temperature.
• The vehicle is not exposed to direct sunlight.
• The ambient temperature is higher than 15°C.
• All dash panel air vents are open.
Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
10. Checking pressures on vehicles 127
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