air conditioner blowing hot air after changing thermostat was working b4 repair

which side of the dash would that be located and if not the vac line could it be the valve door itself is there a diagram on how to replace i'm a single mother and can't afford to pay someone to fix it i need to know how to fix this myself.. thank you

it all depends on which one could go as high as 300.00

thanks i will ask sondmeone else since i am getting the run aroud with your response... i asked specific questions and you tiptoe around it.. thank you for your time

wow really yw good luck