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No heat on 1993 Ford Ranger

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I put in a new thermostat, but the heater still only blows cold air.
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grab the heater hoses at the firewall and if one feels cooler then the other just flush it out with a garden hose,reconnect the hoses then check for heat.i would buy a $4 prestone hydrometer to check for boil over and frezze over protection also.