No heat in my '95

I have no heat in my 1995.   Is there anything I should check before taking things apart to replace the heater core?

Thanks for your help!

(changed title from "upholstery"  aapple)

Hi, Not to insult you, But, is there enough coolant in the car to make the heater operate?  Also, check the thermostat.

Not insulted at all.  Thank you for the suggested, I had not thought that would possibly effect the operation of my heater.

Hello, it may not be a heater core. It may be a blend door actuator. Does the illuminated button blink at all on your HVAC controls? 

I made a video showing how to tell if blend door actuator failed. On a '95, its easy to replace...instead of being on top of heater box, its on bottom. 

https://youtu.be/IOHuxkeSdu0