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Hi Jim, 175 psi is not enough pressure to cause the clutch to slip but if you have 175 psi static pressure you have too much refrigerant in the system. If the gauges settle at around 110 psi your charge is probably okay. I'd make sure you are getting 12V to the compressor clutch. Maybe try jumping 12V to the clutch again and see if it works. Also make sure that your condenser fan is turning on.
Let me know if you have any questions.