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Operation Check The purpose of the operational check is to confirm that the system CONDITIONS: Engine running and at normal operating temperature. PROCEDURE: 1. Check blower 1) Turn FAN CONTROL DIAL to 1. Blower should operate at speed 1. 2) Then turn the DIAL to speed 2. 2. Check discharge air 1) Turn AIR CONTROL DIAL to position. 2) Confirm that all discharge air comes out of face vents. position. 4) Confirm that discharge air comes out of face vents and foot vents. 5) Turn AIR CONTROL DIAL to position. 6) Confirm that discharge air comes out of foot vents, with some air from face vents. 7) Turn AIR CONTROL DIAL to position. 8) Confirm that discharge air comes out of foot vents with some air from defroster vents. 9) Turn AIR CONTROL DIAL to position. 10) Confirm that all discharge air comes out of defroster vents, with some air from face vents. 3. Check recirculation 1) Switch AIR RECIRCULATION SWITCH to ON position (Indica- tor light ON). 2) Listen for intake door position change (you should hear sound change slightly). NHA333 NHA334 RHA035E NHA335 DIAGNOSES — Overall System HA-28 |