Final answer:
Both a leaking heater core and a clogged evaporator case drain tube are plausible causes for wet carpet on the passenger's side of a vehicle. Both components belong to the vehicle's climate control system and can lead to water leaking into the cabin. Therefore, action C, which states that both Technician A and B are correct, is the most accurate response.
Step-by-step explanation:
When diagnosing a wet carpet on the passenger's side of a vehicle, two common automotive issues come to mind. First, Technician A mentions that a leaking heater core could be the culprit. This part of the vehicle's heating system is responsible for providing heat to the cabin. If it leaks, the coolant can seep into the cabin, often resulting in a wet passenger-side carpet and a sweet smell from the antifreeze.
On the other hand, Technician B suggests that the cause might be a clogged evaporator case drain tube. The evaporator case is part of the air conditioning system which dehumidifies and cools the cabin air. When functioning correctly, it collects the moisture and drains it outside the vehicle. However, if the drain tube is clogged, the water can back up into the cabin, leading to moisture buildup on the carpet.
Considering that both explanations are plausible and related to different parts of the vehicle's climate control system, the correct answer is C. Both Technician A and B are correct, as either a leaking heater core or a clogged evaporator case drain tube could be the reason for the wet carpet on the passenger's side of a vehicle. Therefore, a thorough examination of both components may be necessary to pinpoint the exact cause of the leak.