engine SUBARU TRIBECA 2009 1.G Service Owner's Manual
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Page 345 of 2453
AC-19
Refrigerant Pressure with Manifold Gauge Set
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
2. Refrigerant Pressure with Manifold Gauge Set
A: PROCEDURE
1) Place the vehicle in the shade and windless condition.
2) Connect the manifold gauge set.
3) Open all windows and close all doors.
4) Increase the engine to 1,500 rpm.
5) Turn on the A/C switch.
6) Turn the temperature control switch to MAX COOL.
7) Put in RECIRC position.
8) Turn the blower control switch to HI.
9) Read the gauge.
Standard:
Low pressure: 127 — 196 kPa (1.3 — 2.0 kg/cm2, 18 — 28 psi)
High pressure: 1,471 — 1,667 kPa (15 — 17 kg/cm2, 213 — 242 psi)
Ambient temperature: 30 — 35°C (86—95°F)
B: INSPECTION
Symptom Probable cause Repair order
High-pressure side is unusually high.
•Defective condenser fan motor
•Clogged condenser fin
•Too much refrigerant
•Air inside the system
•Defective receiver dryer
•Replace the fan motor.
•Clean the condenser fin.
•Discharge refrigerant.
•Replace the receiver dryer.
•After evacuating again, charge an
appropriate amount of refrigerant.
High-pressure side is unusually low.
•Defective compressor
•Not enough refrigerant
•Clogged expansion valve
•Expansion valve frozen temporarily by
moisture.
•Replace the compressor.
•Check for leaks.
•Replace the expansion valve.
•Fully evacuate the expansion valve.
Low-pressure side is unusually high.
•Defective compressor
•Defective expansion valve
•Too much refrigerant
•Replace the compressor.
•Replace the expansion valve.
•Discharge refrigerant.
Low-pressure side is unusually low.
•Not enough refrigerant
•Clogged expansion valve
•Expansion valve frozen temporarily by
moisture.
•Saturated receiver dryer
•Check for leaks.
•Replace the expansion valve.
•Replace the receiver dryer.
Page 346 of 2453
AC-20
Refrigerant Recovery Procedure
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
3. Refrigerant Recovery Proce-
dure
A: PROCEDURE
CAUTION:
•During operation, be sure to wear protective
goggles and protective gloves.
•Connect the refrigerant recovery system with
the manifold gauge set to discharge the refrig-
erant from the A/C system and recycle the gas.
•When recycling the discharged refrigerant,
keep service cans on hand. Because the recov-
ery rate with the recovery system is approx.
90%, service cans are necessary to charge the
refrigerant.
•Follow the detailed operation procedure de-
scribed in the operation manual attached to the
refrigerant recovery system.
1) Perform the compressor oil return operation.
2) Stop the engine.
3) Make sure the valves on low-/high-pressure
sides of manifold gauge set are fully closed.
4) Install the low-/high-pressure hoses to the ser-
vice ports on the low-/high-pressure sides of the
vehicle respectively.
5) Connect the center hose to the refrigerant recov-
ery system.
6) Follow the operation manual to activate the re-
frigerant recovery system.
(A) Low-pressure gauge (Compound pressure
gauge)
(B) High-pressure gauge
(C) Close
AC-00021
(A) (B)
(C)(C)
(A) Low-pressure gauge (Compound pressure
gauge)
(B) High-pressure gauge
(C) Close
(D) Low-pressure side service port
(E) High-pressure side service port
AC-00022
(A) (B)
(C)(C)
(E)(D)
Page 348 of 2453
AC-22
Refrigerant Charging Procedure
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
7) Note the low-pressure gauge reading.
8) Leave it at least 5 minutes, and then check the
low-pressure gauge reading for any changes.
If the gauge indicator shows near zero point, it is a
sign of leakage. Check pipe connector points, re-
pair them, and make sure there is no leakage.
9) Follow the can tap operation manual, install to
the refrigerant can.
10) Disconnect the center manifold hose from the
vacuum pump, and connect the hose to the tap
valve.
11) When a 13.6 kg (30 lb) refrigerant container is
used, measure the weight of the refrigerant amount
to use using a scale.
12) Confirm that all the 3 hoses are connected se-
curely to the manifold gauge set.
13) Open the valve on the HFC-134a source.
14) Loosen the center hose connection on the
manifold gauge set (if applicable, press a purge
valve on the manifold gauge set) for a few seconds
to allow the air in the center hose to escape by the
refrigerant pressure.
15) Stop the engine and carefully open the high-
pressure valve.
CAUTION:
Do not open the low-pressure valve.
CAUTION:
Never run the engine while charging from the
high-pressure side.
16) Close the high-pressure valve when the low-
pressure gauge reaches 98 kPa (1 kg/cm2, 14 psi).
Using a leak tester, check the system for leaks.
If any leakage is found after the refrigerant recov-
ery is completed, repair the applicable area.
(A) Tap valve
(B) Center manifold hose
(A) Refrigerant container (HFC-134a)
(B) Scale
AC-00027
AC-00028
(A)
(B)
AC-00029
(A)
(B)
(A) Low-pressure gauge (Compound pressure
gauge)
(B) High-pressure gauge
(C) Close
(A) Low-pressure gauge (Compound pressure
gauge)
(B) High-pressure gauge
(C) Close
(D) Ignition switch OFF
(E) Slowly open
AC-00030
(A) (B)
(C)(C)
AC-00031
(A) (B)
(E)
(D)
(C)
Page 349 of 2453
AC-23
Refrigerant Charging Procedure
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
17) After confirming that there are no leaks with the
leak test, charge the required amount of refrigerant.
CAUTION:
Never run the engine while charging from the
high-pressure side.
18) Close the high-pressure valve when;
•the readings of low- / high-pressure gauges be-
come almost equal, after the charging speed is re-
duced,
•the HFC-134a source becomes empty, or the
system is full with the gas.
19) If the HFC-134a source is empty, close the
high-pressure valve, close the valve on the can tap,
and replace the HFC-134a source with a new one
to restart the operation.
20) Confirm that both the low- / high-pressure
valves can be closed. Start the engine with the A/C
switch OFF.
21) Quickly repeat ON-OFF cycles a few times to
prevent initial compressor damage.
22) Set up the vehicle as follows:
•A/C switch ON
•Engine running at 1,500 rpm
•Blower setting speed “HI”, (For models with rear
coolers, also turn the rear cooler fan switch to “HI”)
•Temperature setting to “MAX COOL”
•Air inlet setting to “RECIRC”
•Window open
23) While reading the low-pressure gauge, careful-
ly open the low-pressure valve with the refrigerant
source connected and the service hose purged.
CAUTION:
Never open the high-pressure valve with the en-
gine running. The high-pressure gas will back-
flow resulting in an explosion of the can.
24) Adjust the refrigerant flow to maintain the pres-
sure on the low-pressure side at 276 kPa (2.81 kg/
cm2, 40 psi) max.
25) After the system is fully charged, close the low-
pressure valve.
26) Close the valve on the refrigerant source.
27) Disconnect the hose from the service port, and
install the service port cap.
(A) Low-pressure gauge (Compound pressure
gauge)
(B) High-pressure gauge
(C) Close
AC-00032
AC-00033
(A) (B)
(C)(C)
Refrigerant amount
Refrigerant Minimum Maximum
HFC-134a 840 g (1.85 lb) 900 g (1.98 lb)
AC-00034
Page 350 of 2453
AC-24
Refrigerant Leak Check
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
5. Refrigerant Leak Check
A: INSPECTION
1) At engine speed below 1500rpm, operate the A/
C system for approx. 10 minutes, and confirm that
the high-side pressure shows at least 690 kPa
(7.03 kg/cm2, 100 psi). Then stop the engine to
start the leak test.
2) Starting from the connection between high-pres-
sure pipe and evaporator, check the system for
leaks along the high-pressure side through the
compressor. The following items must be checked
thoroughly.
3) Check the joint and seam between pressure
switch (dual switch) and high-pressure pipe.
4) Check the connections between condenser and
pipes, and welded joints on the condenser.
The leak tester may detect the oil on the condenser
fins as a leak.
5) Check the joint between compressor and hoses.
6) Check the machined area of the compressor and
other joints on the compressor.
7) Check the compressor shaft seal at the area
near the center of compressor clutch pulley.
Some shaft seals show a slight amount of leakage,
about 3 g (0.1 oz) per year. This is not a problem.
8) Starting from the connection between low-pres-
sure pipe and evaporator, check the system for
leakage along the low-pressure side through the
compressor. The following items must be checked
thoroughly.
•Connection between 2 parts
•Connection between pipe and plate
•Connection between pipes
9) Visually check the rubber area of the flexible
hose for cracks.
Check the entire length of the flexible hose, espe-
cially the connection with the metal hose end.
CAUTION:
Carefully check the external surface of hoses
and tubes at approx. 25 mm (0.98 in) per sec-
ond.
10) Disconnect the drain hose from the heater
case, and check the hose end for at least 10 sec-
onds.
After the test is finished, reconnect the drain hose.
11) Turn the ignition key to the ON position, and
run the blower at high speed for approx. 1 minute.
Stop the blower to check the ventilation grill on the
instrument panel. While moving the tester closer to
the grill, run the blower for 1 or 2 seconds, then stop
it. Check the grill at that point for at least 10 sec-
onds.
12) Check the valve in the service port.
13) Visually check the rubber seal in the service
port cap.
AC-00035
(A) Flexible hose
AC-00036
(A)
AC-00037
AC-00038
Page 351 of 2453
AC-25
Compressor Oil
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
6. Compressor Oil
A: PROCEDURE
NOTE:
Before making repairs, perform the oil return oper-
ation to return the compressor oil in circulation with
the refrigerant to the compressor.
1) Increase the engine to 1,500 rpm.
2) Turn on the A/C switch.
3) Turn the temperature control switch to MAX
COOL.
4) Put in RECIRC position.
5) Turn the blower control switch to HI. (For models
with rear coolers, also turn the rear cooler fan
switch to HI)
6) Leave in this condition for 10 minutes.
B: REPLACEMENT
NOTE:
•If a component has been replaced, add an ap-
propriate amount of compressor oil (same as the
amount of remaining oil in removed component).
•When replacing the compressor, the new com-
pressor will already have the specified amount of
oil in it. Install the new compressor after removing
the same amount of oil that is remaining in the com-
pressor removed.
Page 359 of 2453
AC-33
Compressor
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
14.Compressor
A: INSPECTION
1. MAGNETIC CLUTCH CLEARANCE
Check the clearance of the entire circumference
around the drive plate and pulley.
Standard:
0.45±0.15 mm (0.0177±0.0059 in)
2. MAGNETIC CLUTCH OPERATION
1) Disconnect the compressor connector.
2) Connect the positive (+) lead from the battery to
the compressor connector terminal, and the nega-
tive (–) lead to the compressor body.
3) Check the magnet clutch engagement.
If there is a problem, replace the compressor.
B: REMOVAL
1) Perform the compressor oil return operation.
2) Turn the A/C switch to OFF and stop the engine.
3) Using the refrigerant recovery system, dis-
charge refrigerant.
4) Disconnect the ground cable from battery.
5) Remove the V-belts.
6) Remove the generator.
7) Remove the bolt and remove the low-pressure
hose and high-pressure hose.
8) Disconnect the compressor harness from the
body harness.
9) Remove the bolts and remove the compressor
bracket.
10) Remove the bolts, then remove the bracket
from the compressor.
C: INSTALLATION
1) Install in the reverse order of removal.
2) Replace the O-rings on low-/high-pressure hos-
es with new parts, then apply compressor oil.
3) After replacing the compressor, adjust the
amount of compressor oil.
4) Charge refrigerant.
Tightening torque:
Refer to “COMPONENT” of “General Descrip-
tion”.
AC-01287
AC-01381
AC-01289
AC-01290
Page 361 of 2453
AC-35
Heater and Cooling Unit
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
16.Heater and Cooling Unit
A: REMOVAL
1. FRONT
1) Disconnect the ground cable from battery.
2) Using the refrigerant recovery system, dis-
charge refrigerant.
3) Drain engine coolant from the radiator.
4) Remove the bolts securing expansion valve and
pipe in engine compartment. Release the heater
hose clamps in engine compartment to remove the
hoses.
5) Remove the instrument panel.
6) Remove the support beam.
7) Remove the blower motor unit assembly.
bly.>
8) Disconnect the actuator connector.
9) Remove the bolt and nuts and remove the heat-
er and cooling unit.
2. REAR
1) Disconnect the ground cable from battery.
2) Using the refrigerant recovery system, dis-
charge the refrigerant.
3) Remove the quarter trim.
4) Remove the bolts, then disconnect the rear tube.
5) Disconnect the harness connector.
6) Remove the nuts, then remove the cooler unit.
B: INSTALLATION
1) Install in the reverse order of removal.
2) Charge refrigerant.
Tightening torque:
Refer to “COMPONENT” of “General Descrip-
tion”.
AC-01294
AC-01295
Page 364 of 2453
AC-38
Hose and Tube
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
18.Hose and Tube
A: REMOVAL
CAUTION:
•When disconnecting/connecting hoses, do
not apply an excessive force to them. After in-
stalling, check that no torsion or excessive ten-
sion applied to the hoses.
•Seal the disconnected hose with a plug or vi-
nyl tape to prevent foreign matter from enter-
ing.
1. FRONT
1) Disconnect the ground cable from battery.
2) Using the refrigerant recovery system, dis-
charge refrigerant.
3) Remove the evaporator unit mounting bolt (A)
and low-pressure hose bracket bolt (B).
4) Remove the low-pressure hose attaching bolts
(C).
5) Disconnect the low-pressure hose from evapo-
rator unit.
6) Disconnect the low-pressure hose from com-
pressor.
7) Remove the low-pressure hose from vehicle.
8) Remove the high-pressure hose attaching bolt
(D).
9) Disconnect the high-pressure hose from com-
pressor.
10) Disconnect the high-pressure hose from con-
denser.
11) Remove the high-pressure hose from vehicle.
12) Remove the high-pressure tube attaching bolt
(E).
13) Remove the high-pressure tube from vehicle.
2. REAR
1) Disconnect the ground cable from battery.
2) Using the refrigerant recovery system, dis-
charge refrigerant.
3) Remove the sheet and floor mat.
4) Remove the ECM bracket and tube protector.
5) Remove the quick connectors (A and B).
ST REMOVER PS 73499XA01A
ST REMOVER PD73499XA00A
NOTE:
Refer to the instruction manual for the ST when
working.
6) Remove the tube bracket.
7) Remove the front tube and rear tube connecting
bolts (C)
8) Remove the connecting bolts (D) of the rear
cooler unit.
AC-01318
(A)
(B)
(D)(C)
(D)
(E)
Page 376 of 2453
AC-50
General Diagnostic Table
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
29.General Diagnostic Table
A: INSPECTION
Symptom Repair order
Blower motor
Does not operate.
Fuse
Blower motor relay
Blower motor
Blower motor resistor
Blower switch
Wiring harness
Strange noiseBlower motor
Air conditioner filter
Compressor
Does not operate.
Refrigerant
Fuse
Air conditioning relay
Magnet clutch
Compressor
Pressure switch
A/C switch
Blower switch
Wiring harness
Strange noise
V- b e l t
Magnet clutch
Compressor
Belt tensioner
Cold air not emitted.
Refrigerant
V- b e l t
Magnet clutch
Compressor
Pressure switch
Expansion valve
A/C switch
Blower switch
Wiring harness
Heater duct
Heater vent duct
Te m p e r a t u r e c o n t r o l d o o r a c t u a t o r
Wa r m a ir n ot e mi t te d .
Engine coolant
Blower switch
Heater core
Te m p e r a t u r e c o n t r o l d o o r a c t u a t o r
Te m p e r a t u r e o f a i r f r o m v e n t s d o e s n o t c h a n g e .
Engine coolant
Air mix door actuator (Auto A/C)
Wire harness (Auto A/C)
Unable to switch blow vents.
Mode door actuator
Air flow switch
Wiring harness
Unable to switch suction vents.
Air inlet select switch
FRESH/RECIRC door actuator
Wiring harness