The freightliner book on page 2.23 shows the sideways fleur de lis with a little thermometer symbol as meaning "High Exhaust System Termperature (Hest) Lamp. In the book this is described as:
"The High Exhaust System Temperature lamp alerts the operator of high exhaust temperature during the regen process when the speed is below 5 mph or during manual regen. The HEST lamp does not signify the need for any kind of vehicle or engine service; it only alerts the vehicle operator of high exhaust temperatures. Make sure the engine exhaust pipe outlet is not direct at any person, or at any surface or material that will melt, burn, or explode." Hope this helps
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09 Tourmaster T40-F
Blue Ox, Honda CRV, US Gear Brake System
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