GOT 'EM!

I loosened the bolts and nuts that hold the brace along the top of the firewall and loosened the crossmember and got just enough room to get the screws out with my wobble joint screwdriver.

Once the cover was off, I then had to disconnect the plastic clamps that hold the water pipes on either side in order to push the pipes back far enough to pull out the heater core. Once out, I was able to change the pod in front of it. That one has to be changed from the inside. The only pods remaining to be changed are the fresh air.

Thanks for the help and suggestions,