If both hoses leading to the heater core are hot, what could be the issue?

When both hoses leading to the heater core are hot, it indicates that hot coolant is circulating through the heater core, which suggests that the heater core itself is likely functioning properly. If both hoses are hot, a misadjusted temperature control cable is a plausible reason for improper temperature regulation inside the cabin. This misadjustment can prevent the temperature control system from fully closing or opening the blend door, thus failing to regulate the amount of hot coolant flowing into the heater core based on the desired cabin temperature.

This malfunction could result in a situation where the heater is not providing the expected temperature adjustment, leading to cabin temperature issues even when the heater core is operational. Understanding this mechanism is crucial in diagnosing heating problems in a vehicle effectively.