Hello , my husbands truck 2004 mazda b2300 is not blowing warm/hot air when the heater is on. We bought a new accuator/ door and installed it but it didnt work. Any advice or suggestions are welcome Thaniks
Get the engine and coolant to operating temperature. The upper hose to the radiator should NOT get warm over time, but should get HOT when the thermostat opens. If it warms, then it is leaking and allowing coolant to bypass, and you won't get full heat.
Once warm, check BOTH hoses to the heater core, on the passenger side, the 5/8-3/4" diameter pair. BOTH should get too hot to keep touching. If only one is hot or warm, your heater core is likely clogged or plugged, and restricting coolant flow. Flushing may help, and if not, replacement should cure that problem. tom
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Check heater control valve --
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