heating and air conditioning...title heating and air conditioning author mario created date 4/1/2020...

Heating and Air Conditioning

Chapter 26

Cooling System Components

• Water pump–Used to circulate

coolant through the engine and cooling system

–Usually driven by the timing belt or accessory drive belts

• Radiator

– Transfers the heat retained in the coolant to the outside air

• Radiator fan

–May be belt driven, electric, or hydraulic

–Used to pull air through the radiator when vehicle speeds are low

• Thermostat

–Usually located in the intake manifold

–Prevents coolant flow from the engine to the radiator until the coolant temperature reaches a certain point

Example of a Cooling System

Thermostats

Click on image above to play video

Fan Clutch

Electric Fan

Mode Controls and Air Flow

Blower Circuit

Refrigerant System Components

• Refrigerant

–All vehicles since 1995 have been equipped with R-134a

–Manufacturers are expected to introduce new refrigerant in future years

• Compressor

– Separates the low and high pressure sides of the system

• Accumulator is placed on the low side of the system after the evaporator and before the compressor

– Used to trap liquid refrigerant before it can enter the compressor

• Receiver dryer is placed in the high pressure side of the system between the condenser and the expansion valve

– Used to store refrigerant until it is needed by the system

• Evaporator

– Transfers the heat in the passenger compartment to the refrigerant

• Condenser

– Transfers heat from the refrigerant to the outside air

• Orifice tube/expansion valve

– Restriction designed to drop refrigerant pressure before it enters the evaporator

Refrigerant System Schematic

Heat Exchange

Air Conditioning Safety

• Always wear safety glasses or goggles

• Never open a hot cooling system

• Keep loose clothing and jewelry away from moving components

Air Conditioning Safety

• Never open the A/C system unless the refrigerant has been reclaimed from the system

• Do not attempt to open, disconnect, or service any high-voltage component or wiring

Coolant Label

Coolant System Testing

Click on image above to play video

Cooling System Pressure Test

• With the engine cool, remove the radiator cap

• Attach the proper adapter to the filler neck

• Apply pressure to the cooling system

–DO NOT exceed the pressure shown on the cap

• Watch the pressure on the gauge

–If the pressure remains steady, there is not a large leak

• With pressure on the system, check the system for leaks

Cap Test

Refractometer Test

Cabin Filter Replacement

heating and air conditioning...title heating and air conditioning author mario created date 4/1/2020...

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