Not heating

I have a 2001 ls with the v8 in it.When I first bought it it was overheating.Fallowed procedure to bleed system and a clear jelly pushed it's way out of the heater bleed valve.Well got it purged,but thermostat hose would not stay on when driving.Noticed that it was brittle and broken so I replaced it and the whole engine fill with a aluminum one.When installing I put in a new thermo.Purged system.It did not over heat,hose stayed on but now there is no heat coming from heater.Please help me diagnose the problem for I have two young ones that have to ride in this frig to get to appointments.Thank you

Whatever that clear jell was probably clogged up your heater core. Need to flush/backflush the core.

I have read that.But I can't find any info on which hose on fire wall is the outlet hose and which is the inlet.Could you help with that.

I have read that.But I can't find any info on which hose on fire wall is the outlet hose and which is the inlet.Could you help with that.

Doesn't matter. Flush both directions.