HAC101 Week 2 Flashcard Heating & Ventilation

Front

Who is correct regarding the engine thermostat and heater core: Tech A says that the engine thermostat controls the flow of coolant through the heater system. Tech B says that the heater core can have engine coolant or refrigerant flowing through it, depending on whether heat or cool is commanded?

Back

Neither A nor B

Front

What is a common coolant mixture ratio of coolant to water in the average vehicle?

Back

50% coolant to 50% water

Front

Some automotive manufacturers are using activated ______ cabin filters, which help trap odors and airborne pollutants such as carbon monoxide and oxides of nitrogen.

Back

Charcoal

Front

Too strong of an antifreeze mixture in the vehicle's cooling system can cause:

Back

poor cooling.

Front

As the engine heats up from the process of burning fuel to create power, the coolant in the engine is also heated, reaching operating temperatures of approximately:

Back

180 - 220°F

Front

Air doors are controlled by any of these methods, EXCEPT: cables, vacuum servos, slave cylinders, electric servos.

Back

slave cylinders.

Front

The defrost time of passenger vehicles has decreased considerably because of the air-conditioner being switched on during the defrost cycle. Select one: True, False

Back

True

Front

Reversing the refrigerant flow through the air-conditioning system would turn your condenser core into an evaporator and provide ample heat for the passenger compartment. True or False?

Back

False

Front

At what mileage increment should in-cabin air filters usually be replaced? Options: 2,000 - 3,000 miles, 5,000 - 7,500 miles, 12,000 - 15,000 miles, 25,000 - 30,000 miles

Back

12,000 - 15,000 miles

Front

Raising the pressure of water 1 psi (7 kPa) raises the boiling point of water approximately _____°F.

Back

3