Rejuvenating 405 - Cooling coil replacement

My 405 is already 12yrs old. Mileage passed 200K km. Engine still in excellent condition. Recently did a "dashboard down" due to Aircond cooling coil sprung a leak. With the dashboard down, replaced new heater matrix. Now, despite being a dozen yr old, she is still able to set comfortable cabin temperature. It's climatic controls function still works !!!

Here are some of the pics I capture for references as to what is behind the dashboard.


This is how the firewall looks like.


The cooling coil are practically blocked and the airflow are "weak"
It was actually worst than this as some of the "biscuit of mud" actually dropped-off before this pic is taken.

This is part of the cooling coil assy. This shows how the airflow from the blower motor to the cooiling coil. So sometimes when we have foul smells, weak airflow, not cold enough, it's most probably the cooling coil is blocked !!. I am still trying to figure out a way to clean the cooling coil without having to remove the dashboard.. it's possible .... maybe some of you out there can come up with a better toolings/gadgets to make it easier.


This is where the flap motor that controls the hot/cold air mixing for the "desired" temperature.

adious amigo for now