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A/c Problem 2000 Rx300


billrx300
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My RX300 recently started putting out warm air especially when idling. I checked the temp from the center outlet and could only get 55 deg air on max recirc. @ 1500 rpm doors and windows closed. Pressures @ 85 deg OD were 52 suction/230 high side @ 1500 RPM doors open. Pressure equalizes within a few seconds after compressor shut-off. The sight glass is dirty on the inside, can't see through it at all, not sure how long it has been that way. The only code displayed was 21 in the garage (solar sensor). Sometimes it works perfectly especially after being off for several hours. Compressor became noticeably louder a few weeks ago. Any ideas appreciated.

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