. . . in my case anyway. In 2018 I cleaned the radiators & ac condensers and fabricated grill guards for all three front openings for my 2004 Boxster. The grill guards were fabricated from power coated aluminum grill stock with a 77% open surface area. Mounted from behind the bumper cover, the cooling openings were 100% covered. There’s an old thread about my fabrication and installation here somewhere.
After installation of my 3.8L engine I decided to remove the bumper just to do a preventive maintenance of check the radiators & condensers. What I found surprised me. While not as bad as in 2018, I did find significant pulverized buildup between the radiators and condensers.
Because it’s obvious that I’ll still need to clean these areas every two or three years I removed the grills to restore 100% flow. Pics below of the grill material used and the pulverized material found between the radiators and condensers during my inspection in July 2021.
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice 
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