My 2004 chevy tahoe's a/c and heating stopped working when the day before it had worked just fine what should I do or suggestions?

 

1. first step is to make sure ac compressor is engaging.
2. try jumping the compressor pressure switch on the accumulator, compressor will engage, check for cold air.
3. make sure the compressor is getting power by jumping ac relay. compressor will engage, check for cold air.
4. check freon pressures with a gauge set. static pressure/system pressures if compressor is engaged.

my trip through the ac problem:
https://www.tahoeyukonforum.com/thre.../#post-1561667

 

I think first step is to tell us whether air is coming out the vents like it used to, both location and force of air. Or is air coming out at windshield or under dash? You haven't told us much of anything !!!

 

Yep, first bit of info is the blower even working ?