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The low side will be low and most likely be in the vacuum range of the gauge. Normally the orifice tube or expansion tube will either be in the inlet of the evaporator or in the small liquid line that goes from the condenser to the evaporator see the link for more details.

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โˆ™ 2009-04-21 13:33:09
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Q: AC gauge readings with blocked orofice tube also location of tube?
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