GMC Yukon low heat issue when selecting floor setting on GMC Yukon

Some GMC Yukon owners report experiencing low heat issues specifically when selecting the floor setting, which can be attributed to several potential causes. These include low coolant levels or air in the cooling system, which may lead to reduced heat output. Additionally, a clogged heater core can restrict the flow of hot coolant, adversely affecting heating performance. Some owners also find that a malfunctioning thermostat results in improper temperature regulation, further impacting heat output. Furthermore, issues with the blend door actuator, responsible for directing airflow, can contribute to these heating problems. Other potential factors include problems with the water pump, cabin air filter, blower motor, or HVAC control unit. It is advisable for owners to systematically check these components to effectively identify and resolve the root cause of the low heat issue.