The heater core in my car was tested *good* by the radiator shop, and I've cleaned up the heater/def box for re-installation and I've a few questions for those of you who have done this before.
1) there was a 'thick material'? on the heater door (behind the heater core) which either served to insulate? or to dampen noise ?from the blower. Of course this material was deteriorated and came off during the cleaning operation. Now for re-installation, I'm unsure if I need anything to replace it, and if so, what is the preferred material for doing so ?
2) The heater core was installed inside the box using a 'weatherstrip' like material to seal the core against the heater box. Again, this material came off/out when I cleaned it, and again I've a question of what I should use to reseal that area?
The external (firewall) blower motor housing seemed to be sealed to the firewall using gray 3M rope seal, so I plan to put that back to augment what was left there.
PS. I also found a date code on the Heater Core (Harrison 69 J' ) Does anyone know what month J is for heater cores? is it September? My car is an 09C..
Any other suggestions from you guys before I do this task?