1997 GMC C1500 Won't stay warn

1997 GMC C1500
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ALOZANO
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Heater problem
1997 GMC C1500 6 cyl Two Wheel Drive Automatic

I recently replace the water pump the thermostat on my truck the pump was leaking and the heater works but was not giving out heat. after replacing the parts I had the engine flushed and new coolant installed. I tested the heater and it would warn up but then start to cool down it will not stay warn.
Mar 3, 2010 at 10:42 PM
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JACOBANDNICKOLAS
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Are both heater core hoses staying hot?
Jun 5, 2010 at 9:28 PM