Hi, EA is loosing water , and the passenger footwell is wet, also water spits out the firewall near what appears to be a drainhole.

I want to attack it from the inside, and find/fix this leak, any tips or tricks I should kno? or is it too easy to be asking questions?

no easy fix. have to take out the heater box which means removing the dash and replacing the heater core. its a pain in the butt! :

Its a big job,probably not much in it though.I replaced a heater core in a EF Fairmont ghia,not too long ago.But being an EA you might have a couple of less things to remove and disconnect but the process is still the same.Like the previous member mentioned you will need to remove the dash.