Quote:
Originally Posted by NickelB NL
This is my upper grillblock. I've made it from 5mm scrap aluminum. I fits nicely and run it trough the heatwaves. Only in standing traffic the fan comes on to cool it down again and turning off. Only to slowly warm up over a 40 50 seconds time.
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Caution! With modern cars, controlling water temperature is not the only reason for underhood air flow. Electronics can also (easily) overheat, and (less easily) batteries too. Styling, FWD, exterior aero all have the makers squishing down underhood volume far more than in the past with a consequent rise in temperatures, even with the stock cooling air inlets.
On my RX-8 for example, there are cooling ducts from the lower radiator intake to both a box containing a bunch of electronic modules and to the box containing the battery. Likewise, on my Chevy Volt, blocking the upper grill opening can damage the inverter and its controlling electronics.
YMMV