Auto Repairing 1999 Ford Ranger Workshop Manual
PINPOINT TEST A: INCORRECT/ERRATIC DIRECTION OF AIR FLOW FROM OUTLET(S) CONDITIONS DETAILS/RESULTS/ACTIONS A1 CHECK THE SYSTEM AIR FLOW Start the engine and run at idle. Set the blower motor speed to maximum. Check for correct air flow in each function selector switch position at engine idle speed. Is there air flow only from the defroster outlets in each function switch position? Yes GO to A2. No GO to A14. A2 CHECK THE VACUUM SUPPLY HOSE CONNECTIONS Check for a disconnected vacuum supply hose between the engine manifold and the vacuum reservoir tank. Is the hose connected? Yes GO to A3. No RECONNECT the hose. TEST the system for normal operation. A3 CHECK FOR VACUUM FROM THE RESERVOIR Start the engine and run at idle. Plenum Vacuum Harness Check for vacuum at the black vacuum hose. Is there vacuum? Yes GO to A10. No GO to A4.
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