3.8 hr. reg. time for heater core with air and factory warranty time is only 2.4 hr.
How would you like to be a dealership tech?
But not all dash is removed for just heater core just trim and outside shell more or less.
As said you need to start a new thread and givr all and more info.
Like what it is doing or not doing and what is acting up,
Code P0070 is a abs code.
Code P0707 is a transmission inhibitor switch problem.
Mufflers are like AC units.
Should drain out moisture and condensation.
Drain holes on mufflers and resonators should be on rear with rear lower than front of muffler.
Sometimes stop up and water may leak out muffler seams.
Just make sure drain is open and at lowest point of muffler.
As Jim said it does not work with antifreeze.
But does do it job when mixed with water.
Nasty smelling stuff and likes to eat up water pumps and stop up rad and heater cores.
Hard to get in my neck of the woods.
Drug stores and swimming pool supply places sometimes will get it for...