Pickup 4WD L4-2366cc 2.4L SOHC (22R) (1984)
Vacuum Solenoid Valve HVAC: Testing and Inspection
Fig. 20 Vacuum switching valve test.
Disconnect electrical connector and vacuum hoses from valve.
Check for continuity between each valve electrical terminal and valve body using ohmmeter. If meter indicates continuity, valve is shorted.
Measure resistance between valve terminals with ohmmeter. If resistance is not 38-44 ohms, valve is defective.
Connect battery to valve terminals using jumper wires, then blow air into port A, Fig. 20. Air should be discharged through port B.
Disconnect battery and blow air into port B. Air should be discharged through filter C, but not through port A.
If valve fails to perform as outlined, valve is defective.