Heater blows cold air

We need some more information here.
Is the air completely cold when the engine is warm?
Do you have any overheating issues on the engine?
Do you smell antifreeze inside the vehicle or do you see any evidence of leaking?
Does this vehicle have climate control? If so does it have zones?
The answer can be one of many things lets see if we can narrow it down a bit.
For instance it could be:
Bad heater core
Bad cold air blend door
Bad Heater Control valve
low coolant
Climate control not working correctly
wiring issue
etc.

Hi and thanks for using 2CarPros.com.

As mentioned in the prior reply, it could be a few things. What I need you to do is follow this link. It discusses the issues which cause a heater not to work. Also, it shows what to check, and how to repair.

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

Once you have had the chance to look through it and try some of the things mentioned, let me know what you find. If you need additional information for a specific repair, I can supply you with it and help you through the process.

I will watch for your reply.

Take care,
Joe