Both Technician A and Technician B are correct; a thermostat that opens too soon and low coolant levels can both cause poor heater operation. These components are critical in maintaining the proper heating function in a vehicle. Therefore, the answer is that both technicians are correct. ;
Both Technician A and Technician B are correct; a thermostat that opens too soon and low coolant levels can both lead to poor heater operation. Each of these components is vital for proper heating functionality in a vehicle. Therefore, the answer is: C) Both Technicians A and B.
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