Pinpoint Test E: Insufficient Air Conditioning (A/C) Cooling - Auxiliary System
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- E1 CHECK THE MODE DOOR OPERATION
- Key in OFF position.
- Remove the rear lower body side trim panel. Refer to INTERIOR TRIM AND ORNAMENTATION .
- Key in ON position.
- With the engine running, cycle the function selector switch between FLR and NORM A/C or MAX A/C.
- Check the mode door for operation between the heater core and evaporator core positions.
- Does the mode door operate correctly?
- Yes : CHECK the thermostatic expansion valve for correct operation. INSTALL a new valve if necessary. TEST the system for normal operation.
- No : GO to E2.
- E2 CHECK FOR SOURCE VACUUM
- Key in OFF position.
- Disconnect: Auxiliary Vacuum Control Motor.
- Connect the vacuum pump to the vacuum supply hose.
- Key in ON position.
- With the engine running, cycle the function selector switch from FLR to NORM A/C or MAX A/C.
- Measure the supply hose vacuum.
- Is the vacuum between 61-71 kPa (18-21 in-Hg)?
- Yes : GO to E3.
- No : LOCATE the vacuum hose restriction or leak. REPAIR the vacuum hose as necessary. TEST the system for normal operation.
- E3 CHECK THE VACUUM CONTROL MOTOR
- Key in OFF position.
- Carry out a vacuum leak test on the auxiliary vacuum control motor.
- Connect the vacuum pump to the auxiliary vacuum control motor.
- Apply 61-71 kPa (18-21 in-Hg) of vacuum to the auxiliary vacuum control motor.
- Check for a vacuum drop.
- Does the vacuum drop?
- Yes : INSTALL a new vacuum control motor. TEST the system for normal operation.
- No : CHECK for a sticking mode door and REPAIR as necessary. TEST the system for normal operation.