It may be that my 1989 Ranger Rover has a different A/C & heater set-up than what you've mentioned here--but I'm about ready to get the hacksaw out and saw through the plastic that houses the A/C unit in order to get the heater core out. It seems the bottom passenger side of the dash surrounds the entire A/C unit, and runs all the way to where the switches are for such things as the window heater, defrost, etc... thus blocking the direction I'd use to pull out the heater unit. Everything is off--top dash, instrument cluster, console, I've even unbolted the unit. Am I missing something? I don't want to mess with the A/C on this, and right now it looks impossible unless I saw away.