Heater not working?

Tiny
DEEDHD
  • MEMBER
  • 2006 CHEVROLET EQUINOX
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 176,000 MILES
Only cold air blows out vents. I have replaced the thermostat and coolant. Also "burped" the system. I don't believe there is a heater core issue as there is no antifreeze smell or film on windows. The last trip I took with the SUV I noticed when I got home (about 20 miles driven) the fan under the hood was on. The fan stayed on for approximately 15 minutes. Are there any fuses that are associated with the heating system that I should check the panel? What should I check next?
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Thursday, November 17th, 2022 AT 4:24 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If you have no heat, either the heater core is clogged, or the blend air door actuator isn't working.

First, start the engine and turn the heat on high. Allow the engine to reach operating temperature. Once reached, turn the engine off, open the hood, and feel both heater core hoses at the firewall. Both should be hot. If that is the case, then the heater core isn't clogged. Keep in mind, one of the hoses will be slightly cooler simply because it is the return hose.

If you look at pic 1 below, I circled the heater hoses and what they will look like under the hood at the firewall.

Next, if both hoses are hot, then we know heat is present but not making its way into the vehicle. That is likely caused by a faulty blend air door actuator. Have you ever noticed any clicking or ticking coming from the dash area?

The blend door/air temperature actuator is located under the dash to the right side of the center. Behind the glove box. See pic 2. I attached the directions for replacing it. Before you actually purchase one, check the heater core hoses as I mentioned above. Next, remove the actuator and while it is still connected, see if it responds when you request different temperatures. If there is a clicking you hear at times, replace the actuator.

Let me know what you find or if you have questions.

Take care,

Joe

See pics below.
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Thursday, November 17th, 2022 AT 7:29 PM

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