I have little to no heat... I had the coolant changed about 3 weeks ago and a new t-stat put in, any idea why it will only blow cold air...

thanks

 

Was the heater core flushed? It would help to know what year vehicle you have and any other pertinent information (engine, drivetrain, etc).

There are a few possibilities. Pretty much the worst one would be a clogged heater core. Depending on the age of the vehicle, it could also be a blend door malfunctioning.

 

hello, It is a 2001 chevy trailblazer, looks just like a blazer (not the new model). 4.3L 4x4. when the fan is on low I can hear a ticking sound, and the sound comes and goes when the fan is on high. I'm not sure if the heater core was flushed, I'll inquire.

heater core was not flushed... one hose is warm the other is cold... was told it is plugged up and needs to be cleaned, with an acid then flushed out.... anyone have this done?