The heater core is like a radiator in a house. They can't normally be repaired, assuming that it is leaking, they are normally replaced. You can see how big a job it is by looking in a Haynes manual.
Terry
September 2006
I can answer this question...
how do you repair an heater core on a punto and where can i get a diagram?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.