Volkswagen Golf / Golf GTI / Jetta. Manual — part 980

87-127

Refrigerant system has been open longer than

the time required for normal repairs (i.e.
following an accident)

Based on temperature and pressure

measurements, system is diagnosed with
moisture contamination

Compressor is replaced due to noises or

internal damage

Flushing is required after replacing certain

components in certain situations

Page 87-

87

.

Flushing

Use compressed air and nitrogen (available

locally) to remove moisture, impurities and old
refrigerant oil from A/C refrigerant system.

First blow out old refrigerant oil and dirt with

compressed air, then dry components with
nitrogen.

DO NOT blow compressed air and nitrogen

through the compressor or expansion valve.
Only blow compressed air and nitrogen through
disconnected, free flowing components (i.e.
disconnected hose, condenser, evaporator,
etc.)

DO NOT blow compressed air and nitrogen into

a capped off A/C component. Pressurized R-
134a refrigerant in the presence of oxygen may
form a combustible mixture.

A/C refrigerant system, servicing

13/2/2005

87-128

Always flush components in opposite direction

of refrigerant flow.

Flush evaporator through the low-pressure line

with the high-pressure line removed.

If any component has dark thick deposits that

cannot be removed with compressed air,
replace component.

Thin light gray deposits in refrigerant lines and

hoses are normal and do not impair the function
of the system.

Always replace receiver drier after flushing.

Dispose of contaminated refrigerant (PAG) oil

following laws governing hazardous waste
disposal. Do not combine PAG oil with any
other old oils such as engine oil or transmission
fluid.

A/C refrigerant system, servicing

13/2/2005

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A/C refrigerant system, evacuating and
recharging

WARNING!

Always use an Underwriter's Laboratory (UL)
approved refrigerant recovery/
recycling/recharging unit such as Kent-
Moore ACR

4

, or equivalent, when evacuating

and recharging an R-134a A/C system.

Any person who services a motor vehicle air
conditioner MUST, by law, be properly
trained and certified and use approved
refrigerant recycling equipment. Technicians
must complete an EPA approved recycling
course to be certified.

State and local governments may have
additional requirements regarding air
conditioning servicing. Always comply with
state and local laws.

Always wear safety goggles when
discharging, evacuating and recharging an
A/C system.

CAUTION!

Always follow manufacturer's instructions
when using a refrigerant
recovery/recycling/recharging unit.

A/C refrigerant system, servicing

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Notes:

Refer to R-134a safety measures prior to

discharging or charging A/C refrigerant system

Page 87-69

.

Follow refrigerant recovery/recycling/recharging

unit manufacturer's instructions for evacuating
and recharging A/C system.

Evacuate refrigerant system for a minimum of

30 minutes.

When recharging A/C system, add correct

amount of refrigerant and PAG oil to system

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.

After system recharge, manually rotate A/C

compressor approx. 10 turns before starting
engine. Start engine with A/C OFF. After idle
speed has stabilized, switch A/C ON and let
engine idle (compressor running) for a minimum
of two minutes before raising engine speed.

A/C refrigerant system, servicing

13/2/2005