r/LexusGX • u/Curious-Donut5744 • 11d ago

Mechanical Advice AC Compressor Leaking?

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2017 GX460 with about 110k miles. I was doing its yearly oil change (don’t drive much anymore) and while inspecting the nooks and crannies I noticed a bunch of sludge at the bottom of the AC compressor. It was leaking 2 years ago so I had it replaced, but embarrassingly, I didn’t look to see if they had cleaned up the leakage. Looking at it now, is it likely that’s old oil or is this compressor leaking as well?

Any advice would be great!

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u/EmersonLucero 11d ago

Get a UV light. The oil used in the system is UV reactive to help find leaks.

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u/Curious-Donut5744 11d ago

Oh that’s a great idea, thanks!

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u/EmersonLucero 11d ago

Also check the schrader valves on the high and low side. Hopefully you have caps on them. If so, open each slowly in a quiet area to hear any hiss. If the valve is leaking pressure will build up inside the cap.