Heater not working

Tiny
ANDREW NORMAN SR
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
My heater went out in my truck. I replaced the heater core and thermostat.
Tuesday, November 7th, 2017 AT 10:28 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If you still have no heat, allow the engine to warm up to operating temperature with the heater on high. At that point, feel both heater core hoses. One is a supply hose and the other a return hose. Both should be hot. If they are, suspect the blend air door is not functioning to allow the heat to enter the vehicle. If one is cold and the other hot, either there is a blockage in the system or you have an air lock not allowing the coolant to flow through the heater core.
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Tuesday, November 7th, 2017 AT 6:54 PM

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