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If your vehicle has a sight glass in the liquid refrigerant line[the small line] you should see very few or no bubbles after the system is up and running. Many cars do not have a sight glass. The large refrigerant line should feel cool/cold to the touch if the system is operating correctly. Place a thermometer in a discharge duct. Temperature should be 40/50 degrees depending on ambient conditions. Will be higher with high humidity.

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13y ago
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