Jim,

Thanks very much for the response. I expected this to be at least one of the replies.

I REALLY don't want to disturb my perfectly tight evaporator! I have found two special tools online that may allow me to get these two screws out. These two screws are all that's between me and the heater core.

Before I would disturb the evaporator, I will just leave the heater core. It is not leaking currently.

Thanks again for your reply.

If anyone else has a suggestion I will really appreciate it.

Have a great day,