volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

System Relay, HVAC > < Low Pressure Service Valve, Removing (A/C Refrigerant System)|Page 4815
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Sight Glass: Description and Operation

A/C Refrigerant System Component Functions, Overview

Sight glass (if equipped)

With a properly charged A/C system and A/C clutch engaged, the sight glass (arrow) should remain clear and bubble-free.

NOTE:  The mixture of R-134a refrigerant and refrigerant oil (PAG oil) may appear milky in the sight glass.

System Relay, HVAC > < Low Pressure Service Valve, Removing (A/C Refrigerant System)|Page 4815