need tips - step by step instructions

What's a heat box? Blower? Heater core? Really need some more information/what's-not-working-info in your posts...

...If you do indeed need to replace the heater core, here are a couple links for you..

...This first one is a good read of the whole replacement...
http://www.explorerforum.com/forums/showthread.php?t=173650&highlight=heater&page=2

...And if necessary, removing the dash...:(
http://www.explorerforum.com/forums/showthread.php?t=230020

welcome

Welcome to this forum! The 2 links in post # 3 didn't work. Could you check them?

...Thanks, I fixed them...;)