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My heater is blowing cold air ,i changed thermostat and heater core ,what else could i do,it on a 98 f 150

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You need to have two things in order to have heat: hot coolant flowing through the heater core, and air flow through the core and into the vehicle. With the engine warmed up, feel both heater hoses where they connect to the heater core. They should both be hot. If not, then you need to find out why there is no coolant flow. If you have already replaced the core, then you probably have coolant flow. Next, check the HVAC doors to make sure they operate properly, particularly the blend door. If the door is not in the proper position, then you will not have airflow through the heater core and into the vehicle.

Posted on Aug 24, 2010

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