Heating and ac

AIR CONDITIONING & CLIMATE CONTROL

TOYOTA COURSE 752 – AIR CONDITIONING & CLIMATE CONTROL 3
VAPORIZATION
PAGE 2-1

Hot and Cold
a. Hot attracted to cold – heat flows from hot
area to cooler area.
b. Removal of Heat (not really cooling), lowers
temperature.
HEAT TRANSFER HOT TO COLD

TOYOTA COURSE 752 – AIR CONDITIONING & CLIMATE CONTROL 6PAGE 2-6
REFRIGERATE CIRCUIT

SOURCES OF HEAT IN A
PASSENGER CAR

2-WAY AIRFLOW
Fresh, dry external air to the upper area
Warm internal air to the footwell area
External Air

A/C SYSTEM COMPONENTS
TOYOTA COURSE 752 – AIR CONDITIONING & CLIMATE CONTROL

BASIC COMPONENTS
PAGE 3-1

SWASH-PLATE COMPRESSOR
PAGE 3-5
Show Animation

PISTON-TYPE A/C COMPRESSOR
PAGE 3-6
Suction Discharge
Down-Stroke Up-Stroke

THROUGH-VANE COMPRESSOR
PAGE 3-6
Discharge Valve
Exhaust Port
Rotor
Sludging Valve
Valve
Rotor Housing
Intake Port
Through-Vane
Discharge Reed Valve

SCROLL COMPRESSOR CYCLE
PAGE 3-10
Compression
Discharge
Port
Discharge
Suction
Variable
Scroll
Fixed
Scroll
Intake
Port

COMPRESSOR CLUTCH
PAGE 3-11
Rotor
Stator Coil
Bearing
Stator
Pressure Plate

DAMPER LIMITER PULLEY
Spoke
Portions
DamperLimiter Mechanism
PAGE 3-12

CONDENSER
PAGE 3-14

RECEIVER-DRIER
Sight Glass
Receiver Tube
Receiver Body Filter
Desiccant
Drier
OUT
IN
PAGE 3-15

SIGHT GLASS
Receiver-Drier
Sight Glass
Insufficiently
Charges
Properly
Charges
PAGE 4-2

EXPANSION VALVE
PAGE 3-1
Valve
Pressure
Spring
Diaphragm
Diaphragm Chamber
Outlet
Capillary Tube
Equalizer Circuit
(For Internal Equalizer Type)
Heat-
Sensing
Tube
Inlet

BLOCK TYPE EXPANSION VALVE
PAGE 3-2
Valve

ORIFICE TYPE EXPANSION VALVE
PAGE 3-2

EVAPORATOR
PAGE 3-3

THREAD TYPE FITTINGS
HFC-134a CFC-12
PAGE 3-19

QUICK DISCONNECT FITTING
PAGE 3-20

MULTI-PRESSURE SWITCH
PAGE 3-18
Compressor
Clutch
Condenser Fan
(High Speed)
Source Voltage Source Voltage
Magnetic Clutch C ontrol
Low
Pressure
(NC)
Medium
Pressure
(NC) High
Pressure
(NC)

COOLING FANS
PAGE 3-21
Condenser Fans Engine Cooling Fan
Cooling Fan
Pulley Water
PumpFluid
Coupling

REVIEW BASIC A/C COMPONENTS

A/C REFRIGERANT CYCLE
PAGE 3-24

DIAGNOSIS AND REPAIR

1. 6-Step Diagnosis Procedure
1. Verify the complaint
2. Determine related symptoms
3. Analyze the symptom
4. Isolate the cause
5. Correct the cause
6. Check for proper operation
6-STEP DIAGNOSIS PROCEDURE

2. System Checks
1. Performance Test – Outlet temperature 35°F – 45°F
2. Check coolant level
3. Compressor belt tension
4. Click test – compressor drive
5. Outlet airflow checks (clean air filter[s])
6. Sight glass in high pressure line
7. Touch test: Low (cold), High (hot)
SYSTEM CHECKS

SIGHT GLASS
PAGE 4-2
Receiver-Drier
Sight Glass
Insufficiently
Charges
Properly
Charges

a. Visual inspection (stains)
b. Check system pressure
c. Recover refrigerant
d. Evacuate to remove moisture
e. Partial charge (to 50 psi), then check for leaks
f. Repair leaks as needed
g. Recharge system, check performance (including fan)
h. Remove debris/dirt from condenser
A/C SPECIFIC MAINTENANCE AND
INSPECTION

A/C PRESSURE GAUGE
PAGE 4-5

NORMAL SYSTEM PRESSURE
PAGE 4-6

ELECTRONIC LEAK DETECTOR
PAGE 4-8

FLUORESCENT DETECTION DYE
PAGE 4-8

REFRIGERANT IDENTIFIER
PAGE 4-10
Sample Exhaust Port;
On Rear of Case
Portable Case;
Bottom Half
Control Panel
Sample Inlet Port
System Pressure
Gauge
Sample Filter
Printer Port
Purge Vent Port
Air Intake Port
Power Cord

RECOVER/RECYCLE/RECHARGE
STATION
PAGE 4-7

R-134A PREVENTS
PENGUIN SUNBURN
PAGE 4-7

DRIVE BELT TENSION GAUGE
PAGE 4-11
Belt Tension Gauge
A/C Compressor
Crankshaft Pulley

AUTO DRIVE BELT TENSIONER
Automatic tensioner belt wear range:
A = “Normal” range
B = New belt range
PAGE 4-11

CLEARING CONDENSER DEBRIS
PAGE 4-14

A/C SYSTEM CONTROLS

TEMPERATURE CONTROL SYSTEM
PAGE 5-1

HEATER CONTROL VALVE
PAGE 5-1

CABLE-OPERATED HEATER
CONTROL VALVE
PAGE 5-2
OUT
IN
Rotary Valve

AIR MIX TEMPERATURE CONTROL
PAGE 5-3
Air Mix Control Damper
Heater Core

AIR MIX SERVO-MOTOR
PAGE 5-3

AIR MIX BLEND DOOR
PAGE 5-4
Evaporator
Blend Door
Heater Core

CLEAN AIR FILTER
PAGE 5-6
Clean Air Filter

HEPA Filter and Fresh Air Inlet
56

HVAC Housing and Ducting
57

58

59

60

A/C CONTROL PANEL
PAGE 5-7

CONTROL OF AIR DISTRIBUTION
SCHEMATIC
PAGE 5-7
Heater
Evaporator
Inlet
Blower Motor
FACE Vents

AIRFLOW THROUGH SYSTEM
PAGE 5-8

Air Flow Ducting
64

AIR OUTLET/MODE CHART
PAGE 5-9

REAR AIR CONDITIONING
PAGE 6-18

End Heating and AC Systems
67

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