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1997 F-150 Heater is blowing warm air not hot Would this be the thermostat or heater core Anti-freeze is full. Engine temp stays in the lower middle of the gauge.?
Wiki User
∙ 16y ago
The thermostat is the most likely culprit. The major clue is that the engine temp stays in the lower middle of the gauge - the heater core would not cause this. The thermostat is most likely stuck in the open position - needs replacement.
Wiki User
∙ 16y ago
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