Heat not working on 98 gmc jimmy. Replaced thermostat, checked fluids. Blows air but no heat. Have...
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Heat not working on 98 gmc jimmy. Replaced thermostat, checked fluids. Blows air but no heat. Have automatic temp controls and when put on auto nothing at all comes through vents but if put back to manual then cold air blows out, Replaced actuator this summer, could that have messed something up? How can I flush the heater core?