New Sanden Compressor: High Suction/Low Discharge Pressure?

[1998_K1500_Sub]

It’s been quite awhile since I changed the vac pump oil…I’ve probably pulled over a dozen systems down with it, both 134 and 410.

Understood.

I change mine pretty often, but that's because I often have tramp flush that vaporizes and re-condenses in the vac oil, causing the pump to lose efficiency (won't vac fully).