Specifications

A/C System Components

3-21

TOYOTA Air Conditioning and Climate Control – Course 752

The effectiveness of the A/C system depends on removing heat as the hot

refrigerant flows through the condenser. Because of this, cooling fans

ecome more critical when the A/C system is ON. There are two fans that

contribute toward heat transfer in the engine compartment:

• A/C Condenser Fan

• Engine Cooling Fan

A/C Condenser Fans are driven either manually from the engine or

electrically. Some Toyota vehicles use a belt-driven fan. Most current

vehicles use electric fans. A fan circuit contains the following components:

• Coolant Temperature Switch (thermo-switch)

located in the water jacket

of the cylinder head. The coolant temperature

switch is normally closed

(NC). When the coolant temperature is cold/cool, the circuit path

through the switch is complete (ON). The switch opens (OFF) when

the coolant temperature exceeds a specified value, typically around

190° F (90° C).

Cooling Fans

Two types:

Mechanically or

Electrically driven.

Condenser Fans

Engine Cooling Fan

Fluid

Coupling

Pulley

Fan Bracket

Cooling Fan

Fig. 3-24

752f324

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