G'day All,
After some scrapping away of decades of accumulated crud on the engine bay side of the rusty area I noticed what looks like a plate that fits between the heater blower mounting plate and the firewall. This means there could be three layers of steel - the newly discovered plate, the firewall and then the internal plate that starts high on the foot well then bends over and rises towards the bottom of the dash panel as part of the firewall.
From some digging around with a steel blade to get under the crud it looks like the rust is mostly in the plate that sits directly under the heater blower. I can see that offset from the two top corners is what is either a spot weld in each corner of the plate or maybe two holes that have been drilled in the plate but not drilled through the firewall. Maybe the plate was designed to be reversible - or they really are two spot welds?
From the surface rust evident around where the hole has rusted out of the plate I figure taking the mud guard off and hitting the whole immediate area around that part of the firewall with an angle grinder with a wire brush might be a good idea. Then some rust treatment, followed by a couple of coats of red zinc paint; finished off with some top coats, could be some good steps to take before putting things back together. So far it looks like the worst of the rust is in the plate directly underneath the heat blower mount. Sometimes you can be lucky
Kind Regards
Lionel


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