Why is my 2001 Chevy Blazer heater blowing cold air?

  • Thread starter Thread starter Cory H
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Cory H

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For the past few days, my truck's heater has been blowing cold air. I check the engine coolant and it was low (really low). I added coolant but the heater is still blowing cold air. How do I tell if it is a bad heater core or a thermostat?
 
Unless the heater core is completely stopped up it will blow a little warm, it may very well be your thermostat.Do a simple Replacement of the thermostat. not that expensive, and even if its not the problem it all comes with summer and weatherization of your vehicle. also befo you change the thermostat feel your heater hoses to see if they are at least warm if they are hot it may be your heater core.good luck wit this.
 
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