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3-1TOYOTA Air Conditioning and Climate Control – Course 752ExpansionValveIn the previous sections, we referred to the functions of the A/C components.

Section 3Some scroll compressors in Toyota vehicles contain a built-in oil separator.This chamber helps separate the compressor oil from the refrigera

A/C System ComponentsCompressorClutchA drive belt from the crankshaft pulley drives the compressor. Some systems use V-belts and some use a flat, mult

Section 3The electromagnet allows A/C operation to be controlled by an electriccircuit. The compressor clutch relay is also controlled by a temperatur

A/C System Components3-13TOYOTA Air Conditioning and Climate Control – Course 752To reduce the overall length of the engine, accessories may be driven

Section 33-14TOYOTA Technical TrainingIn order to condense hot refrigerant gas (vapor) from the compressor discharge port into a liquid, heat must tra

A/C System Components3-15TOYOTA Air Conditioning and Climate Control – Course 752Many Toyota vehicles now use a sub-cool condenser that helps separate

Section 33-16TOYOTA Technical TrainingThe outlet of the receiver-drier connects to a siphon tube that goes to thebottom of the container. This acts as

A/C System Components3-17TOYOTA Air Conditioning and Climate Control – Course 752PressureReliefDevicesFor safety, every pressurized system must have s

Section 33-18TOYOTA Technical TrainingLines andHosesThere may be one or more pressure switches in the refrigerant lines.Current models use a Multipres

A/C System Components3-19TOYOTA Air Conditioning and Climate Control – Course 752refrigerant changes. As a rule:•The high-pressurelines are smallestin

Section 33-2TOYOTA Technical TrainingMost Toyota models now use a block-type expansion valve where both theevaporator inlet and outlet pass through th

Section 33-20TOYOTA Technical TrainingA quick-disconnect type fitting uses a plastic clamp lock to connect thetube endings. This type of fitting has n

A/C System Components3-21TOYOTA Air Conditioning and Climate Control – Course 752The effectiveness of the A/C system depends on removing heat as the h

Section 33-22TOYOTA Technical TrainingElectric cooling fan systems were first used in transverse-mountedengines in front-wheel drive vehicles (the dri

A/C System Components3-23TOYOTA Air Conditioning and Climate Control – Course 752• Refrigerant Pressure Switch. This switch normally monitors refriger

Section 33-24TOYOTA Technical TrainingBased on the physics of heat transfer, an automotive A/C system workson these principles:•Heat is absorbed from

A/C System Components3-25TOYOTA Air Conditioning and Climate Control – Course 752ExitPrintNextBookmarksHome

EvaporatorA/C System ComponentsThe action between the expansion valve and the evaporator is the key toheat transfer in the system. The evaporator is t

Section 3CompressorSince the evaporator surface temperature can be close to 32° F (0° C),there could be a problem in high humidity conditions when moi

A/C System ComponentsAn important difference between a compressor and a pump is that a compressor cannot pump liquids. Since liquids cannot be compres

crankshaft supported by ball bearings. Lubrication is provided by asplash from a sump in the compressor base. Construction of reciprocating compressor

A/C System ComponentsThis valve prevents damaging the through-vanes or the reed valve (whichshould “see” only refrigerant gas) by allowing liquid oil

Section 3The Variable Capacity swash-plate compressor uses a solenoid controlvalvethat opens and closes to adjust the low-pressure inlet to the compre

A/C System ComponentsA Scroll Compressor is a spirally wound, fixed scroll and variable scrollthat form a pair. The fixed scroll is integrated with th