A vehicle with insufficient heater performance is being discussed. Technician A says the problem could be a stuck-open engine thermostat. Technician B says air could be trapped inside the heater core. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. A stuck-open engine thermostat can prevent the engine from reaching its normal operating temperature, reducing the heat available for the heater. Air trapped inside the heater core can also prevent the proper flow of hot coolant through the core, reducing heater performance.

A Vehicle with Insufficient Heater Performance Is Being Discussed