no heat!!!!

itz been freezin here for a few dayz n everything waz fine....now all da sudden i have no heat at alllll whut would this be

Could have ice blocking the heater core, the coolant valve leading to the core could be jammed, gummed up, or rusted (very common).

Low On Fluid..check You Radiator..r U Overheating?.....is Your Thermostat Sticking...is It Wet On Your Passenger Side Floor..if It Is Wet Thats Your Heater Core....if Your Overheating...or Leaking...it Could Be Low Fluid In Radiator..or Your Waterpump Or Thermostat...what Else Is Happening Along With No Heat????cuz There R A Few Things It Could Be.

I once had a chev with the same problem and never did figure out what the problem was, but it wasn't any of the suggestions made so far. Three of my close friends are mecahnics, so I had lots of input. The only other thing I though it might be was a plugged heater core, but I never got around to checking that before I got rid of the car, but both lines were warm so it would seem that coolant, or at least some coolant, was making it's way through the heater core.