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PVS with 4 Connections

  1. Disconnect vacuum hoses at PVS valve. Connect a vacuum gauge to top port of the PVS. Connect external vacuum source to the second port.
  2. Start engine and warm up until PVS opening temperature is reached. See chart  . If no vacuum, this portion of the PVS is damaged and valve should be replaced. If vacuum, proceed to next step.
  3. Connect gauge to the third port and vacuum supply to the bottom port. If vacuum is noted, PVS is okay. If no vacuum, replace PVS.
    Fig 1: Sectional View of 4-Port PVS
    G09337140Courtesy of FORD MOTOR CO.
PVS Opening Temperatures

Color Code Temp. (°F)
Pink or Natural Above 90
Black Above 100
Blue or Plain Above 133
Yellow or Gray Above 155
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