Town Car V8-4.6L (2008)
Service Port HVAC: Description and Operation
SERVICE GAUGE PORT VALVES
The high-pressure service gauge port valve is located on the compressor-to-condenser discharge line.
The low-pressure service gauge port valve is located on the suction accumulator.
The fitting is an integral part of the refrigeration line or component.
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Special couplings are required for both the high-side and low-side service gauge ports.
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A very small amount of leakage will always be detectable around the Schrader-type valve with the service gauge port valve cap removed, and is
considered normal. A new Schrader-type valve core can be installed if the seal leaks excessively.
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The service gauge port valve caps are used as primary seals in the refrigerant system to prevent leakage through the Schrader-type valves from
reaching the atmosphere. Always install and tighten the A/C service gauge port valve caps to the correct torque after they are removed.
