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Air conditioning works…. sometimes

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PJ2DMD

PJ2DMD

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So, it’ll start cold and then about 20 minutes into the flight the air isn’t cold anymore. If I shut it off for 10 minutes it’ll work again for a short time before fizzling out again. HVAC guy says this is indicative of a low pressure switch malfunction. I looked in the piper parts catalog and found the following attached figures. Can anybody tell me if that’s the LP switch?
 

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