Ford F-150 2001 Climate Control System Workshop Manual page 6

2001 F-150 Workshop Manual
A6 LEAK TEST THE VACUUM CHECK VALVE
A/C Vacuum Check Valve
A7 CHECK THE VACUUM RESERVOIR
A/C Vacuum Reservoir Tank
A8 CHECK THE SUPPLY HOSE
Function Selector Switch Supply Hose
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Inspect the A/C vacuum check valve for an obstruction and/or correct operation. Airflow through the A/C vacuum
check valve should be in the direction toward the engine (engine connection site is marked "VAC").
Is the A/C vacuum check valve plugged or obstructed?
Yes
INSTALL a new A/C vacuum check valve. TEST the system for normal operation.
No
GO to A6.
Connect the A/C vacuum check valve to a vacuum pump with two hoses and a tee fitting.
Apply 51 kPa (15 in-Hg) vacuum on the A/C vacuum check valve and observe the gauge reading.
If the vacuum loss exceeds 3.37 kPa (1 in-Hg) per minute, remove the A/C vacuum check valve from the pump
and plug the vacuum hoses. Apply 51 kPa (15 in-Hg) of vacuum with the pump to be certain hoses and tester are
not the cause of the leak.
Does the A/C vacuum check valve lose more than 3.37 kPa (1 in-Hg) of vacuum in one minute?
Yes
INSTALL a new A/C vacuum check valve. TEST the system for normal operation.
No
RECONNECT the A/C vacuum check valve. GO to
Use a vacuum pump to leak test the A/C vacuum reservoir tank.
Does the reservoir leak?
Yes
INSTALL a new A/C vacuum reservoir tank. TEST the system for normal operation.
No
RECONNECT the A/C vacuum reservoir tank. GO to
Use a vacuum pump to leak test the function selector switch supply hose.
A7 .
A8 .
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12/14/2010