only thing that works is the passenger heat

1999 el dorado thats kinda vague but...thats all I got
the passenger defrost & the passenger vents work
...the driverside and both rear vents blow cold air
I'm gonna have to get some duck tape and maybe a
clothes dryer hose till I can figure this out. any help
would be appreciated.

Sounds like a problem with the programmer or one of the diverter valves. Check the computer codes. They usually have the Climate Control system malfunction codes.