As an aside, did Axel ever report back about whether his skid plate was contributing to his overheating problem??
I did some research on this and I don't think the skid plate has any discernible effect on the engine cooling.
When the car is in motion, the main airflow is horizontal and through the grille and radiator. The pan may interfere with air flowing underneath the bumper and into the engine compartment, but it may also help blow the air from the grille past the engine so no clear gain or loss.
In slow-moving traffic, most of the airflow will be generated by the cooling fans. The skid plate may block some airflow, but it may also block the heat radiation from hot black asphalt. Again, no clear gain or loss.
My new shroud and fans were a definite improvement to my cooling system, but on really hot days (we saw more than 100 F over the past week), I could use even more cooling. I'm still looking for parts to finish my oil cooler installation and I'll get my exhaust manifolds Jet-Hot coated the next time I have an excuse to take the engine our of the car.
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Regards,
Axel
1990 SEC, Arctic White w/gray interior, M119.960 326 Hp. engine from 1992 500 SL, 722.370 transmission from 500E (reinforced clutches), 2:82 Differential, Euro Headlamps, 1st Gear Start module, One-Touch Window module and Keyless Entry module all from BergWerks, Bilstein HD Shocks on front axle, H&R lowering springs front and rear, AMG 3-piece 17" rims, 8.5" in the front and 10" at the rear.