I hope I don't sound rude, but if you don't have gauges, you aren't going to get anywherre. It's like trying to troubleshoot an electrical problem without a multimeter.

Get high and low side pressures, ambient temp and vent temp. Post the information and we can offer a lot more help.

Larry

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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