If an exhaust leak is in a cabin heat exchange area, what hazard can occur?

If an exhaust leak is in a cabin heat exchange area, what hazard can occur?

• A. Carbon monoxide can enter the cabin and render occupants unconscious.
• B. No hazard beyond odor.
• C. Increases cabin air pressure.
• D. Improves cabin heating efficiency.

Answer: (A)

The main idea here is that an exhaust leak in the cabin heat exchanger can allow toxic exhaust gases to enter the cabin. Carbon monoxide, a primary concern in this scenario, is colorless and odorless, so occupants won’t notice it without a detector or symptoms. CO binds strongly to hemoglobin, which reduces the blood’s oxygen-carrying capacity. That can lead to headaches, dizziness, confusion, fainting, and, with higher exposure, unconsciousness or death. So the real hazard is CO poisoning, not just an odor or a change in cabin pressure or heating performance.

The main idea here is that an exhaust leak in the cabin heat exchanger can allow toxic exhaust gases to enter the cabin. Carbon monoxide, a primary concern in this scenario, is colorless and odorless, so occupants won’t notice it without a detector or symptoms. CO binds strongly to hemoglobin, which reduces the blood’s oxygen-carrying capacity. That can lead to headaches, dizziness, confusion, fainting, and, with higher exposure, unconsciousness or death. So the real hazard is CO poisoning, not just an odor or a change in cabin pressure or heating performance.