Sequoia 4WD V8-4.7L (2UZ-FE) (2006)
Housing Assembly HVAC: Testing and Inspection
Front Cooling Unit
Inspection
INSPECTION
1. INSPECT COOLER UNIT
a. CHECK EVAPORATOR FINS FOR BLOCKAGE
If the fins are clogged, clean them with compressed air.
b. CHECK FOR CRACKS AND SCRATCHES
If necessary, repair or replace damaged parts.
2. INSPECT COOLER THERMISTOR RESISTANCE
On-Vehicle Inspection
ON-VEHICLE INSPECTION
1. INSPECT FOR LEAKAGE OF REFRIGERANT
a. Remove the console box assembly.
b. Remove the glove compartment door.
c. Remove the lower No. 2 finish panel.
d. Remove the heater to register duct No. 4.
e. Remove the lower LH finish panel.
f.
Remove the lower cover.
g. Remove the blower controller.
1. Disconnect the connector.
2. Remove the 2 screws and blower motor linear controller.
h. Using a gas leak detector, check for leakage.
If there is leakage, check the tightening torque at the joints or check the evaporator.
i.
Install the blower motor linear controller with the 2 screws.
j.
Install the lower cover.
k. Install the lower LH finish panel.
l.
Install the lower No.2 finish panel.
m. Install the glove compartment door.
2. INSPECT COOLER EXPANSION VALVE
a. Set the manifold gauge set.
b. Run the engine.
c. Check quantity of gas with the sight glass in refrigeration cycle.
1. Run the engine at 1,500 rpm for at least 5 minutes.
2. Then check that the high pressure reading is 1.37 to 1.57 Mpa (14 to 16 kgm/sq.cm, 199 to 228 psi).
d. Check the expansion valve.
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/sq.cm, 0 psi).
HINT: When the low pressure reading drops to 0 kPa (0 kgf/sq.cm, 0 psi), there is no difference in temperature between the IN and OUT