Which of the following statements about PTC heaters is not true?     Some vehicles have a PTC heating element in the heater core.     Some vehicles have a PTC element installed in an air duct from the blower housing to increase the air temperature in the ducts.     PTC heaters are electronically controlled and work with the cooling system to provide hot coolant.

Question
Which of the following statements about PTC heaters is not true?
   
Some vehicles have a PTC heating element in the heater core.
   
Some vehicles have a PTC element installed in an air duct from the blower housing to increase the air temperature in the ducts.
   
PTC heaters are electronically controlled and work with the cooling system to provide hot coolant.
   
PTC elements are small ceramic stones that react quickly to changes in current.

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