What can contribute to low suction pressure due to airflow problems?

The broken evaporator fan motor can significantly impact suction pressure because it is responsible for circulating air across the evaporator coil. When the evaporator fan motor fails, it leads to a lack of airflow over the evaporator coil, which is essential for the absorption of heat from the indoor air. This reduced airflow causes the evaporator coil to receive insufficient heat, leading to a drop in suction pressure.

Low suction pressure can result in the system being unable to effectively draw in refrigerant from the evaporator and complete the refrigeration cycle. This disruption can cause the system to underperform, potentially leading to ice formation on the evaporator coil and decreased cooling capability.

Dirty condenser coils, leaking refrigerant lines, and high ambient temperatures can affect system performance as well, but they primarily impact the condensing process or refrigerant charge rather than directly influencing the airflow over the evaporator coil, which is crucial in determining suction pressure.