How much do you know about hybrid car cooling systems?
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Questions and Answers

What is the purpose of the thermostat in the ICE cooling system?

  • To regulate coolant flow to both the heater core and ICE water jacket until the coolant reaches approximately 195°F (correct)
  • To regulate coolant flow to both the heater core and ICE water jacket until the coolant reaches approximately 100°F
  • To regulate coolant flow to the heater core only
  • To regulate coolant flow to the ICE water jacket only

    • What is the function of the electric fan in the ICE cooling system?

  • To circulate coolant to the heater core
  • To stabilize coolant temperature (correct)
  • To regulate coolant temperature
  • To provide heat to the passenger compartment

    • What is the advantage of using an electric water pump in hybrid electric vehicles?

  • Increased cooling capacity
  • Increased durability
  • Increased efficiency and reduced emissions (correct)
  • Increased power output

    • What is the purpose of an auxiliary water pump in some vehicles?

    <p>To circulate coolant to the heater core</p> Signup and view all the answers

    What are the diagnostic steps for a failed auxiliary water pump?

    <p>Verify the customer concern, inspect the engine cooling system, check for codes with a scan tool, and consult service information</p> Signup and view all the answers

    What is the purpose of the coolant heat storage system in Toyota Prius?

    <p>To limit emissions and improve drivability during cold starts</p> Signup and view all the answers

    How is the coolant heat storage tank built in Toyota Prius?

    <p>With an inner and outer casing, vacuum formed between them to prevent heat transfer</p> Signup and view all the answers

    What is the purpose of the water valve in the coolant heat storage system in Toyota Prius?

    <p>To direct coolant flow between the storage tank, ICE, and heater core</p> Signup and view all the answers

    How are PTC heaters used in the coolant heat storage system in Toyota Prius?

    <p>To convert electrical energy into heat</p> Signup and view all the answers

    When are PTC heaters turned on in the coolant heat storage system in Toyota Prius?

    <p>When the coolant temperature is low and MAX HOT is requested</p> Signup and view all the answers

    Study Notes

    • The ICE cooling system maintains a narrow temperature range for optimal efficiency and performance.
    • The system also provides heat to the passenger compartment through the heater core.
    • The water pump is the heart of the cooling system and is driven by the ICE accessory drive belt.
    • A thermostat is used to regulate coolant flow to the ICE water jacket and heater core until the coolant reaches approximately 195°F.
    • The electric fan and thermostat work together to stabilize coolant temperature.
    • Hybrid electric vehicles often use an electric water pump for increased efficiency and reduced emissions.
    • An auxiliary water pump may be used to circulate coolant to the heater core in some vehicles.
    • A failed auxiliary water pump may result in reduced heater performance or disable the hybrid drive system.
    • Diagnostic steps for a failed auxiliary water pump include verifying the customer concern, inspecting the engine cooling system, checking for codes with a scan tool, and consulting service information.
    • The heating system's temperature can be adjusted by changing the position of the blend door and the percentage of air that is sent through the heater core.
    • Coolant heat storage system used in Toyota Prius to limit emissions and improve drivability during cold starts.
    • Coolant heat storage tank built with inner and outer casing, vacuum formed between them to prevent heat transfer.
    • Approximately 3 quarts of coolant stored inside inner casing, can be kept warm for up to three days.
    • Water valve used to direct coolant flow between storage tank, ICE, and heater core.
    • Water valve controlled by ECM and consists of electric motor, drive gears, rotary valve, and valve position sensor.
    • Storage tank pump used to move coolant through heat storage tank when ICE is shut off.
    • PTC heaters built into heater core and footwell air ducts used to boost heat to passenger compartment.
    • PTC heaters convert electrical energy into heat.
    • A/C electronic control unit turns on PTC heaters when coolant temperature is low and MAX HOT is requested.
    • PTC heaters sometimes referred to as "glow plugs" in service information.

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    Description

    Test your knowledge of hybrid vehicle cooling and heating systems with this informative quiz! From the ICE cooling system and water pump to auxiliary pumps and PTC heaters, this quiz covers all the basics of how these systems work to keep you comfortable while driving. Challenge yourself with questions about system components, diagnostic steps for identifying issues, and more. Whether you're a mechanic or a hybrid vehicle enthusiast, this quiz is sure to expand your knowledge of these innovative systems.

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