If you have not looked at the inside of your heater blower assembly, you'd be surprised at how gnarly it is inside.
What started as a quick fix to seal the assembly to the side cowl ended up in a total re and re.
Evidently the material/sealing grey foam has less than a 40 year life span. Not surprising, but hidden until you open it up.
Essentially a combination of grey desiccated dusty degraded foam and greasy grey degraded foam.
Crack into it, you'll breathe better and you'll get a much improved air/heat delivery.
i used 1/8 cork on both sides of the internal baffle and varying thickness and widths of peel and stick "weather stripping"
to achieve a seal btw assembly/side cowl and assembly/fire wall side of cowl.
What started as a quick fix to seal the assembly to the side cowl ended up in a total re and re.
Evidently the material/sealing grey foam has less than a 40 year life span. Not surprising, but hidden until you open it up.
Essentially a combination of grey desiccated dusty degraded foam and greasy grey degraded foam.
Crack into it, you'll breathe better and you'll get a much improved air/heat delivery.
i used 1/8 cork on both sides of the internal baffle and varying thickness and widths of peel and stick "weather stripping"
to achieve a seal btw assembly/side cowl and assembly/fire wall side of cowl.