How do I replace the heater core on my 1994 Mazda B4000 4x4 on 1994 Mazda B4000

Windows fog up often and little heat from system

Asked by for the 1994 Mazda B4000
Contact me at jmgrhm30@gmail.com for help with this problem. There's a TSB concerning this problem.
2 answers
i think you have to pull the dash off