Navigator 2WD V8-5.4L (2007)
Expansion Valve: Customer Interest
A/C - Compressor Cuts Out in High Temperatures
TSB 07-26-3
12/24/07
A/C COMPRESSOR - CUTS OUT HIGH AMBIENT
TEMPERATURES/SEIZED - POOR A/C
PERFORMANCE - BUILT BEFORE 11/1/2007
FORD:
2007-2008 Expedition
LINCOLN:
2007-2008 Navigator
This article supersedes TSB 07-25-1 to update the symptoms, Service Procedure and vehicle built date.
ISSUE
Some 2007-2008 Expedition and Navigator vehicles built before 11/1/2007 may exhibit symptoms of slow to cool, not cool enough or variations in
cooling performance. This may be due to lack of desiccant cartridge filtering causing system contamination and/or shifting of the desiccant cartridge in
the integrated receiver/drier causing erratic condenser performance.
Additionally, some vehicles may exhibit a loss of A/C compressor operation in ambient temperatures greater than 110 °F (43 °C) when the vehicle is
stationary for longer than 15 minutes, with the transmission in gear. Placing the vehicle in Park does not resume A/C operation. This may be due to high
A/C head pressures caused by contamination in the system.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
Follow standard workshop manual diagnostic procedures for customer complaints of A/C slow to cool, not cool enough. If no issues are identified and
on-road evaluations indicate a lack of cooling performance relative to similar vehicles, use the following.
Proceed directly to the Flushing Service Procedure steps, to correct the condition of A/C compressor seized or high A/C head pressures.
NOTE
AFTER PERFORMING THE TSB FOR THE A/C SHUT DOWN, DURING HIGH AMBIENT TEMPS AND EXTENDED IDLE, ADVISE
CUSTOMER TO RUN THE A/C IN THE MAX A/C POSITION, REDUCE BLOWER FAN SPEED FROM THE HIGHEST SETTING, TURN
OFF THE AUXILIARY A/C AND PUT THE VEHICLE'S TRANSMISSION INTO THE PARK GEAR POSITION TO CONTINUE TO
RECEIVE COOL AIR FROM YOUR A/C SYSTEM.
NOTE
CHECK THE AIR DEFLECTORS THAT SURROUND THE CONDENSER FOR BEING OUT OF POSITION OR BEING UNSECURED. THIS
MAY ALLOW THE HOT ENGINE COMPARTMENT AIR TO RECIRCULATE AND CAUSE ADDITIONAL LOAD ON THE A/C SYSTEM.
NOTE
WHEN DEBRIS IS PRESENT THROUGHOUT THE ENTIRE SYSTEM, IT IS IMPERATIVE TO COMPLETELY CLEAN THE A/C SYSTEM
TO PREVENT REPEAT FAILURES FROM RESIDUAL DEBRIS THAT CONTAMINATES THE SYSTEM AFTER THE INITIAL FAILURE.
TO PREVENT REPEAT FAILURES, THE FOLLOWING SERVICE PROCEDURE MUST BE PERFORMED, FOR ALL SYMPTOMS LISTED
IN THIS TSB.
A/C SLOW TO COOL/NOT COOL ENOUGH
1.
Measure compressor suction and discharge pressures and compare them with the ranges shown in Workshop Manual (WSM), Section 412-00.
2.
Conduct the evacuation of R134a per Workshop Manual (WSM), Section 412-00: Climate Control System - General Procedures.
3.
Remove the Receiver Drier Cartridge from the vehicle per the WSM, Section 412-01 and inspect for debris at the bottom of the cartridge below
the lip seal before discarding.
4.
If there is no debris below the cartridge lip seal and the compressor suction and discharge pressures are within the shop manual ranges, only
replace the desiccant cartridge. Install a new Receiver Drier Cartridge, plug with 0-rings, snap-ring and dust cap included in the kit, and install
condenser into the vehicle.
