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Old 02-25-2012, 10:22 AM
Fleetliner Fleetliner is offline
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With the engine at normal operating temp. feel both heater hoses where they go through the fire wall. If both hoses are about the same temp. then the heater core is doing its job. If one hose is considerably cooler there is a restriction to the system.(plugged core) If the heater core is flowing and there is no heat out of the vents the problem is either the blend air door or the actuator for the blend air door is not operating. Most common is the door broken.
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