remove the glove box, remove the small screws holding the fan, turn the fan sideways, and take it out. Might have to jimmy it around a bit, tight space. Now comes the fun part. Start to remove all the little screws that hold the heater core box from the inside, just before that, you should remove the 2 heater hoses from inside the engine compartment, and look for I believe 2 nuts that also hold the heater box from the same area as the heater hoses. Check for linkage from inside, wiring, etc. and remove the box. Theres your heater core. Should keep you busy for 3 or more hours. Good luck.