90S Quattro (Canada) V6-2.8L (AAH) (1993)
Refrigerant: Technical Service Bulletins
Basics When Working on Refrigerant System
CAUTION
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Keep work area and all tools clean.
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Use only tools, equipment and parts specified for use with R-134a.
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Always wear protective glasses and gloves when working on A/C refrigerant system.
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Switch on existing exhaust/ventilation systems when working on the refrigerant system.
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Discharge A/C system before removing any A/C refrigerant system component.
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Always use an Underwriter's Laboratory (UL) approved refrigerant recovery/recycling/recharging unit such as Kent-Moore ACR4, or equivalent,
whenever discharging an R-134a A/C system.
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Immediately plug open connections on A/C components to prevent dirt and moisture contamination. Likewise, DO NOT remove new component
from packaging until ready to install. Immediately tighten component connections after installation.
CAUTION
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Always replace O-rings, DO NOT reuse. Use only the correct size and type of 0-rings specified for use with R-134a refrigerant. Lubricate 0-ring
with refrigerant oil before installing.
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Use only the specified PAG oil from a sealed container and ALWAYS reseal oil container immediately after use. DO NOT use oil if it has become
contaminated with moisture or if oil container has been left open.
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Always reinstall cap(s) over A/C service valve(s).
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DO NOT flush refrigerant system with R-11.
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Evacuate refrigerant system for a minimum of 30 minutes.
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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.
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DO NOT top-off a charged refrigerant system. Instead, discharge, evacuate and recharge system.
Note
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For Information on A/C wiring see applicable wiring diagram.
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See also A/C refrigerant system safety measures.
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Green label in engine compartment indicates A/C system is charged with refrigerant R-134a.
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Only a high pressure service valve is used for A/C system servicing. A low pressure service valve is not installed in the A/C system. Perform all A/C
system service operations (i.e discharging, evacuating, recharging) through the high pressure service valve only.