Because the Schrader valve depressor is too tight to do anything. Pull back just enough to push on the schrader valve in the mini-split, but not so far that it fails to seal. After tuning, he pulled out the perfect vacuum.
🌬️ UView Airlift Cooling Checker 550000
9 Review
💨 Robinair (15115) VacuMaster Single Stage Vacuum Pump - For Efficient Single-Stage Vacuuming, Delivers 1.5 CFM
9 Review
Robust Robinair (RG3) Portable Refrigerant Recovery Machine, 115V, 60Hz -Efficiently Recovers Liquid and Vapor Refrigerant
9 Review
🔍 UView 560000 Combustion Leak Tester: A Reliable Tool for Efficient Diagnosis
9 Review