Heater blowing cold air?

THere is a vent called the blender door. It is located near the heater core and determines if you get heat or AC. Chances are it is damaged or just sticking. This guide can help you see what's going on.

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

let me know

Hve you checked to see if there was antifreeze in the cooling system. Make sure it isnt low. Also check and see if the beld door is moving on the HVAC. Let me know what you find and ill see what I can do to help.

Ok first thing you may want to do is change the thermostat, it may be stuck partially closed, also check the coolant level and top it off properly

Heater core may be clogged or the mode door bad

Check the air-mix actuator.

Check for trouble codes.

Hi, thanx for the donation, A couple of things, during the thermostat replacement, you could have fixed the problem, however you may have created a new one, which is an air pocket, air gets trapped in the system when either the coolant becomes low and you refill it or you replace a thermostat and air bubble gets trapped, I would bleed the system, also you may want to have it pressure tested to determine, if there is a clogged heater core etc. Another thing is the engine coolant temperature sensor, have that checked to be sure there is no problems with it. Other than that, you should be cleared up with the things I suggested. Keep me posted.

Hi and thanks for using 2CarPros.

Either the blend air door actuator (which is what I think they replaced) is bad, or it has become disconnected or jammed for some reason. I doubt the heater core has anything to do with this.

If the component has failed, disconnected, or not properly installed, you will not get heat. It is located under the dash on the passenger side of the vehicle. I attached a couple pictures for you to use as a reference. You will need to craw around under there to see if. However, since you just had the work done and it only worked one day, I would take it back.

Let me know if this helps or if you have other questions. Also, once you locate the component, try adjusting the heater in the vehicle and you should feel it working.

Take care,
Joe

Start by replacing the thermostat and see what happens