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Overheating_Heater Blows Cold

(1990 Ford F-250)
in Volcano, CA on December 04, 2010
Four months ago I flushed the system and replaced thermastat due to over heating. Now engine overheated , tried to turn on heater while i pulled over and it blows cold air.
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on December 04, 2010
either low in coolant or you may have blown a head gasket

Roy
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on December 05, 2010
I flushed the system with water and replaced the coolant..how will i know if its the head gasket? thank you.
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