I have a 1989 Nissan Maxima with a bad heater core. Can anyone give me an idea on the how big of a job it will be to replace the core, I have purchased a new one that is ready to go in. I am a first timer with this forum and any advanced information will surely help make the changeout easier.

 

plan on using the better part of a weekend.

 

Thanks for the warning, I attempted to change one out a few weeks ago on an 1999 Expidition, only to put is back together after about 5 hours of dimantling, and letting Ford fix it for $400.00. It was money well spent!

 

I think 8 hours is the expected time to do it.
you may want to try getting ahold of matt93se (i think it's 93) he's in texas and works "cheaply"