Lincoln Aviator: Climate Control System - General Information / General Procedures - Refrigerant System Tests - 3.0L EcoBoost
Inspection
-
NOTE:
Procedure 1 — Ambient Temperature below 21 °C (70 °F).
NOTE:
Proper A/C system diagnosis on a vehicle’s
compressor is dependent on correct refrigerant system charge and tested
in ambient temperatures above 21°C (70°F). Perform the following steps
to achieve normal operating pressures.
Drive the vehicle or run the engine until it reaches normal operating temperature.
-
Set the A/C system
temperature to the highest possible temperature setting with the dual
function disabled (if equipped). Manually set the blower on HI. If the
vehicle has a fresh air/recirc button, set it to recirculation. If the
vehicle has an A/C switch or compressor on switch, set it to A/C OFF.
-
Close all the vehicle windows and doors.
-
Allow the vehicle to idle for 5 minutes.
-
Confirm the cabin temperature is above 24 °C (75 °F). Set the A/C switch or compressor on switch to MAX A/C ON.
-
Allow the vehicle to idle for 5 minutes.
-
Turn engine off and proceed to procedure 2 — ambient temperature between 21 °C (70 °F) and 38 °C (100 °F).
Inspection
NOTE:
Procedure 2— Ambient Temperature between 21°C (70°F) and 38°C (100°F)
-
Run the engine until it reaches normal operating temperature.
-
Connect the air conditioning service unit to the refrigerant system.
-
Set temperature to the lowest possible temperature
setting with the dual function disabled (if equipped). Manually set
blower on HI. If the vehicle has a fresh air/recirc button, set it to
FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
-
Open all vehicle windows and leave the hood open for the test. Open the rear doors.
-
Confirm the compressor is operating and the engine
cooling fan(s) are operating or engaged. Allow the vehicle to idle until
the suction (low-side) and discharge (high-side) pressures are stable
or fluctuate in a range that repeats.
-
Record the ambient (shop) temperature.
-
Record the discharge pressure. If the pressure is fluctuating, record the average value.
-
Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures 21 - 38° C (70 - 100° F) Ambient (30 - 60% Relative Humidity) chart below.
-
Record the suction pressure. If the pressure is fluctuating, record the average value.
-
Determine if the suction pressure falls within the normal operating limits using the Normal Refrigerant Suction Pressures 21 - 38° C (70 - 100° F) Ambient (30 - 60% Relative Humidity) chart below.
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|
-
NOTE:
Use the following table to guide diagnosis of the
refrigerant system if operating pressures are outside normal limits.
Refer to the chart below.
High (Discharge) Pressure
|
Low (Suction) Pressure
|
Component — Causes
|
High
|
Normal to High
|
-
Condenser — inadequate airflow.
-
Engine — overheating.
|
Normal to High
|
Normal
|
-
Refrigerant overcharge — air in refrigerant.
|
Normal to Low
|
High
|
-
A/C Compressor — low performance.
|
Normal to Low
|
Normal to High
|
-
A/C suction line — partially restricted or plugged. a
|
Normal to Low
|
Low
|
-
Low refrigerant charge — leak in system.
-
A/C suction line — partially restricted or plugged. b
|
Erratic Operation or Compressor Not Running
|
-
Ambient Air Temperature (AAT) sensor — poor connection.
-
A/C pressure transducer — poor connection.
-
Evaporator temperature sensor — poor connection.
-
Low refrigerant charge — leak in system.
|
Additional Possible Components or Causes Associated With Inadequate Compressor Operation
|
-
Compressor drive belt — loose
-
Compressor clutch — slipping
-
Clutch coil open — shorted, or loose mounting
-
Control assembly switch — dirty contacts or sticking open
-
Clutch wiring circuit — high resistance, open or blown fuse
-
Compressor operation interrupted by engine computer
|
Additional Possible Components or Causes Associated With a Damaged Compressor
|
-
Incorrect clutch air-gap
-
Suction accumulator — refrigerant oil bleed hose plugged
-
Refrigerant leaks
|
a Low pressure reading will be normal to high if restriction is downstream of service access valve.
b Low pressure reading will be low if restriction is upstream of service access valve.
Inspection
NOTE:
Procedure 3— Ambient Temperature between 21 °C (70 °F) and 38 °C (100 °F)
-
Run the engine until it reaches normal operating temperature.
-
Connect the air conditioning service unit to the refrigerant system.
-
Set temperature to the lowest possible temperature
setting with the dual function disabled (if equipped). Manually set
blower on HI. If the vehicle has a fresh air/recirc button, set it to
FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
-
Open all vehicle windows and leave the hood open for the
test. Open the rear hatch and/or rear doors (if equipped).
-
Confirm the compressor is operating and the engine
cooling fan(s) are operating or engaged. Allow the vehicle to idle until
the suction (low-side) and discharge (high-side) pressures are stable
or fluctuate in a range that repeats.
-
Record the ambient (shop) temperature.
-
Record the discharge pressure. If the pressure is fluctuating, record the average value.
-
Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures 38 - 49° C (100 - 120° F) Ambient (15 - 40% Relative Humidity) chart below.
-
Record the suction pressure. If the pressure is fluctuating, record the average value.
-
Determine if the suction pressure falls within the normal operating limits using the Normal Refrigerant Suction Pressures 38 - 49° C (100 - 120° F) Ambient (15 - 40% Relative Humidity) chart below.
.jpg) |
|
-
NOTE:
Use the following table to guide diagnosis of the
refrigerant system if operating pressures are outside normal limits.
NOTE:
Proper A/C system diagnosis on vehicles with
Variable compressors is dependent on correct refrigerant system charge
and tested in ambient temperatures above 21°C (70°F). Never replace a
Variable compressor without first recovering and recharging the A/C
system to vehicle specification and retesting in ambient temperatures
above 21°C (70°F).
Refer to the chart below.
High (Discharge) Pressure
|
Low (Suction) Pressure
|
Component — Causes
|
High
|
Normal to High
|
-
Condenser — inadequate airflow.
-
Engine — overheating.
|
Normal to High
|
Normal
|
-
Refrigerant overcharge — air in refrigerant.
|
Normal to Low
|
High
|
-
A/C Compressor — low performance.
|
Normal to Low
|
Normal to High
|
-
A/C suction line — partially restricted or plugged. a
|
Normal to Low
|
Low
|
-
Low refrigerant charge — leak in system.
-
A/C suction line — partially restricted or plugged. b
|
Erratic Operation or Compressor Not Running
|
-
Ambient Air Temperature (AAT) sensor — poor connection.
-
A/C pressure transducer — poor connection.
-
Evaporator temperature sensor — poor connection.
-
Low refrigerant charge — leak in system.
|
Additional Possible Components or Causes Associated With Inadequate Compressor Operation
|
-
Compressor drive belt — loose
-
Compressor clutch — slipping
-
Clutch coil open — shorted, or loose mounting
-
Control assembly switch — dirty contacts or sticking open
-
Clutch wiring circuit — high resistance, open or blown fuse
-
Compressor operation interrupted by engine computer
|
Additional Possible Components or Causes Associated With a Damaged Compressor
|
-
Incorrect clutch air-gap
-
Suction accumulator — refrigerant oil bleed hose plugged
-
Refrigerant leaks
|
a Low pressure reading will be normal to high if restriction is downstream of service access valve.
b Low pressure reading will be low if restriction is upstream of service access valve.
Special Tool(s) /
General Equipment
Air Conditioning Service Unit
Refrigerant Oil Injector Set
Filling
Adjust the oil injector piston and fill the oil
injector with the correct amount of clean, new Motorcraft® PAG
Refrigerant Compressor Oil (YN-12-D)...
Removal
NOTICE:
If installing a new A/C compressor due to an internal failure of the old unit, carry out the following procedures to remove contamination from the A/C system...
Other information:
Special Tool(s) /
General Equipment
Feeler Gauge
Check
NOTE:
Refer to the appropriate Section 303-01 for the specification.
NOTE:
Make sure all cylinder head surfaces are clear of
any gasket material, silicone sealant, oil and coolant...
Removal
NOTE:
Removal steps in this procedure may contain installation details.
NOTE:
LH side shown, RH side similar.
Remove the upper belt moulding screw at front of the door.
Torque:
12 lb.in (1.3 Nm)
Lift the moulding at the front edge using a non-marring
trim tool and slide forward to disengage from the tab at the rear and
remove the moulding...