Automobile Electrical and Electronic Systems, 5th Edition

Heating ventilation and air conditioning

529

Stop-and-go driving in heavy trafc

Under these test conditions, high compressor discharge pressures will tend to

overload the motor. To prevent this problem, fresh air must be restricted at idle

to reduce evaporator load and, if possible, the condenser fan should operate

at over-speed conditions. The motor must be operated at lower speeds during

idle to prevent overload and, consequently, will not reach its maximum power

requirement.

Hot soak followed by pull down

This test is established by placing the vehicle in a hot sunny environment until

the cabin temperature rises to about 65°C. The vehicle is ...