how do you get the heater core lines off the core they look like some kind of quick disconnect? but there is not much room in there to work

 

when i replaced the heater core on my 99 i used a hacksaw and cut the heater core lines inside the heater box then pulled the lines towards the engine and through the firewall then you will find that the hoses are a quick disconnect you have to squeeze the plastic ends on the hoses and twist the hose and pull then they will come apart good luck

 

If you take an air nozel to blow as much crap out of the way as you can, then soak them with WD-40 or PB blaster to lube them up they should come. Push in on them as much as you can before trying to press the plastic tabs in to release them. Dont forget about a sawall with a hack saw blade though, but that gets kinda messy.

 

i dont have a problem with it leaking it is pluged up and i need to blow it out some and get it flowing again, the blend door work s as does all the switchs...it just seems lik it is not flowing through it. when i rev it up the heat comes out warm but then fades away when i lower the rpms??????? i dont know what else to try