Volkswagen Golf / Golf GTI / Jetta. Manual — part 979

87-123

A/C refrigerant system, discharging

WARNING!

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

4

, or equivalent, whenever

discharging 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 charging
or discharging system.

A/C refrigerant system, servicing

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87-124

CAUTION!

Always use separate refrigerant
recovery/recycling/recharging servicing
equipment for R-12 and R-134a systems. DO
NOT use one piece of equipment for both R-
12 and R-134a systems. The residual traces
of refrigerant inside the equipment will
contaminate and damage the equipment.
Servicing equipment includes
recovery/recycling/recharging unit, charging
station, vacuum pump, manifold gauges, etc.

DO NOT use R-12 servicing equipment on R-
134a systems or R-134a equipment on R-12
systems or damage to both the vehicle A/C
system and servicing equipment may result.
Use only equipment designed to meet
Society of Automotive Engineers (SAE)
standards.

R-134a and R-12 systems use different size
service fittings. NEVER use adaptors to
convert an R-12 fitting to R-134a size or R-
134a fitting to R-12 size.

Note:

Refer to safety measures starting on

Page 87-

69

prior to discharging or charging A/C

refrigerant system.

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Note:

Make sure that initial set-up of the
refrigerant
recovery/recycling/recharging unit
has been completed before
discharging the A/C system.

CAUTION!

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

- Connect red high-pressure hose -

A- of refrigerant
recovery/recycling/recharging unit
to high side fitting on vehicle and
open coupler valve.

- Connect blue low-pressure hose -

B- of refrigerant
recovery/recycling/recharging unit
to low side fitting on vehicle and
open coupler valve.

- Following refrigerant

recovery/recycling/recharging unit
manufacturer's instructions,
discharge A/C system into
refrigerant
recovery/recycling/recharging
unit.

- Disconnect power supply from

A/C clutch to prevent accidental
compressor operation with A/C
system discharged.

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A/C refrigerant system, flushing with
compressed air and nitrogen

CAUTION!

When using compressed nitrogen always
use a pressure regulator and the proper
adaptor hoses and fittings (available locally).
During flushing, use existing
exhaust/ventilation systems to draw off the
gas mixture escaping from the A/C system.

DO NOT flush R-134a refrigerant system with
R-11. R-11 is not compatible with R-134a
refrigerant and PAG oil and will cause total
system contamination.

Flush refrigerant system with compressed air and

nitrogen if:

Refrigerant oil is dark and viscous (thick)

Too much refrigerant oil is in the system

following compressor replacement

Unclear or do not know how much refrigerant oil

is in the system

Moisture, dirt or other impurities have entered

the refrigerant system (i.e. following an
accident)

Unable to pull a constant vacuum during

evacuation of a leak-free system due to
excessive moisture in the system

A/C refrigerant system, servicing

13/2/2005