PVS with 2 Connections
- Detach both vacuum hoses from PVS and connect a vacuum gauge to top port on PVS. Connect other PVS nipple to manifold vacuum or external vacuum supply of at least 10 in. Hg.
- Start engine and warm up until PVS opening temperature is reached. See chart. If no vacuum reading is noted, PVS should be replaced. If vacuum is present, PVS is okay.