88 blazer bleeder valve for cooling system

Can anyone tell me if an 88 Blazer has a bleeder valve screw for the cooling system? Could this be why my heat is not working and Its running hot all the time?

Already changed water pump, thermostat, radiator, serp belt, etc.

thanks

None on this model that I know of. Might check out the clutch fan though, these go bad and just won't move air. With the engine hot you should hear a lot of air moving when you rev it up a little. Also might take off top of shroud and check the area between the radiator and the AC condensor, often find it full of leaves and such.