No heat and clicking sound

Tiny
TARA-MS DEVA GREEN
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
I had the blend door actuator and thermostat Changed. I'm still hearing clicking noise and still no heat. What could this be? We also added antifreeze.
Sunday, December 15th, 2019 AT 9:15 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

If you had the blend air door actuator replaced, you still hear a clicking, and there is no heat, either the actuator was not installed properly or you have yet another bad one. Did it work properly when you first got it back after having the repairs?

First, I believe this vehicle has dual zone heating and cooling. Basically, the driver and passenger can select different temps. If that is the case, there are two air temp actuators. Do you get heat from one side and not the other? Is the engine warming up to normal operating temperature?

Take a look through these links and let me know if anything mirrors what you are experiencing.

https://www.2carpros.com/articles/car-heater-not-working

https://www.2carpros.com/articles/replace-blend-door-motor

I will watch for your reply.

Joe
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Sunday, December 15th, 2019 AT 7:08 PM
Tiny
TARA-MS DEVA GREEN
  • MEMBER
  • 3 POSTS
No, it didn't work before or after the installation of the actuator and thermostat was replaced. I'm still hearing clicking on the passenger side. The vent blows cold air. I let the car run for at least a half hour. I took it for a drive and it never provided heat. The vehicle isn't running hot. The gauge has always read between cold and hot before and after the parts were replaced. I have no idea what to do next.
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Sunday, December 15th, 2019 AT 7:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,854 POSTS
Hi,

If you still hear a clicking, chances are the actuator is still bad. However, if you do have the dual climate control and get no heat from either side, I suspect the heater core may be plugged. I do have to ask if the clicking is the same as before they worked on it. If it is, either they replaced the wrong one or didn't replace it.

Regardless, here is what I need you to do. Start the engine, turn the heater on high heat, and allow the engine to reach operating temperature.

Next, open the hood and locate the two heater core hoses that attach at the firewall (between the engine and passenger compartment). The outside diameter of the hoses are about 1" and there shouldn't be any others like them. Once located, carefully feel both hoses. If the core is allowing coolant to flow, both hoses will be hot. One will be just slightly hotter than the other because it is a supply hose and the other a return. If only one is hot and the other is much cooler, we need to flush the heater core.

Once you check that, let me know the results. If it needs flushed, I'll explain how it's done. Honestly, it's not hard and can be done with a garden hose.

Also, I recommend returning the vehicle back to the shop that replaced the actuator. Either they didn't replace the correct one, they replaced it with a bad one, or never replaced it at all.

If you look at the pic below, it shows the components related to the HVAC. The air temp actuators are what determine the air temp coming into the vehicle. Note there is one for the left (driver's side) and one for the right (passenger side). So, either they have both failed or the heater core is plugged.

Take care and let me know what you find,

Joe
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Sunday, December 15th, 2019 AT 8:23 PM

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