A/C not working

Hi,

This could be a few different things. Most commonly would be what is called a blend air door actuator. That is what determines the air temperature entering the cab.

Now, I don't know where the vehicle was hit or anything that led to it needing to be rebuilt, so let me know as much as you can.

I would like you to try something when you get the truck back. Do this. Start the engine and turn the heater on high. Allow the engine to reach operating temperature. Then, I need you to turn the engine off and feel both the supply and return hoses from the heater core. Both should be hot. One will be slightly hotter, but not much. If that is the case, then we know it is related to the blend air door actuator.

That leads me to my next question. Does the vehicle have dual climate control? I will need to know that. If it does, are both sides failing to work?

Additionally, you mentioned the cold air comes from all vents. Does this happen all at the same time or do you mean the mode selected (airflow direction) is working properly?

One last question. I need the correct engine size. I attached the options I'm seeing.

Let me know as much as you can, and I'll help you get it figured out one way or another. LOL Also, let me know what was done to date and if any diagnostic trouble codes were provided.

Take care of yourself,

Joe

Hi,

Okay, if you see the door move when changing airflow direction, that won't cause a temperature issue. We need to focus on the blend air door for operation. However, before that, I need you to check something for me.

Start the engine, turn the heat on, and allow it to reach operating temperature. Open the hood and locate the inlet and outlet heater core hoses behind the engine where they go through the firewall. See pic 1 below showing heater core hoses.

Turn the engine off and feel both hoses. Are they both hot? Let me know.

I need to know if the vehicle has automatic climate control or manual climate control. Also, please confirm engine size for me as well. Also, here is a link you may find of interest. It reviews common causes of no heat.

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

Let me know what you find and the additional info I requested.

Take care,

Joe

See pic below.

Hi,

The idea that both hoses are hot is a good thing. LOL It has to do with the air temperature actuators/doors. Heat it getting into the heater core but going no further.

So, here is what I need you to do: Since this vehicle has dual climate control, there will be an actuator for each side. The easiest one to access is the left side. What I need you to do is remove that actuator and while it is still connected to power, change the temperature request for the left side to see if the actuator reacts. If it doesn't, we either have a bad actuator or it's not getting a signal to change the temperature.

When you have it removed, inspect where it is mounted to make sure nothing is broken or causing it to be unable to move the temperature door.

I attached the directions for the removal and replacement of the left actuator. It's a bit of a job, but the right side requires more.

Take care and let me know what you find.

Joe

See pics below.

No problem. I just hope it helps. Here is my theory: If the heater core hoses are both hot, then I know hot coolant is circulating through the heater core in the vehicle. So, the only thing that can prevent heat from entering the cab is one of the blend air doors.

Even if the actuators are good, there is a possibility the doors are damaged or not connected. You indicated it was in an accident, so anything is possible. However, I know the heat is there. We just need to determine what is causing it not to enter the cab.

Let me know. I'm interested in knowing.

Take care,

Joe