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This can result from heater core blockage. If it is partialy blocked, you may notice a little heat with the fan on low, but it goes cool when the fan speed is increased. Other signs of blockage may include engine temperature fluctuation, and/or excessive pinging (pre-ignition). This can also be caused by the engine thermostat being stuck in the open position. Cracked heater core.

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โˆ™ 2006-10-06 10:24:18
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Q: What would cause the heater on a 1994 Ford Ranger not to get warm?
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