Re: Heat stays on
Sounds more like a blend door issue. "In a blend-air system, a blend door controls the amount of unconditioned air (or cooled air from the evaporator) that is allowed to flow through and around, the heater core. A temperature control on the A/C heater control panel determines the discharge air temperature by energizing the blend door actuator, which operates the blend door. This allows an almost immediate control of the output air temperature of the system."