B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Heater Control Valve: Testing and Inspection
1. Start the engine and run it at idle speed.
2. Select mode and check the rod position and vacuum at port A.
3. If rod position and/or vacuum appearance at port A is not as specifications, check the following:
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If vacuum at port A appears in MAX A/C mode but rod position is not correct, replace the water control valve.
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If vacuum at port A appears in A/C, Vent, Panel/Floor, Floor, Floor/Defroster and Defroster modes, check the vacuum control valve.
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If vacuum at port A does not appear in MAX A/C mode, check for leak in a vacuum line and at the vacuum control valve.
