Automotive Certification Practice Exam 2025 – Complete Prep Guide

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What happens if the evaporator drain is clogged?

Air conditioning works less efficiently

Water accumulates in the passenger compartment

When the evaporator drain is clogged, water that would normally drain outside the vehicle is not able to escape. The evaporator, part of the air conditioning system, removes humidity from the air as it cools. This process generates condensation, which is meant to be drained away. If the drain is blocked, this moisture collects and starts to accumulate in the passenger compartment, leading to potential water damage, mold growth, and an unpleasant environment for the occupants.

While it is true that a clogged drain can affect air conditioning efficiency, the most immediate and noticeable consequence of that clogging is indeed the accumulation of water inside the vehicle. This can create additional problems such as electrical issues and odors, making it critical to address a clogged drain promptly to maintain the vehicle's interior environment.

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Engine overheats

Fuel efficiency decreases

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