on 08-03=23, I as driving MB sprinter van on highway Route 84 east toward Connecticut, when I was near Southington exit smoke was coming out of AC vent, I took exit to route 10 and stopped van right after exit on the road, and opened hood, there was active fire near lower left side engine, with help of drivers who stopped behind me, I extinguished fire with fire extinguisher and called MB road service system, police arrived first and towing vehicle from MB arrived and towed van to MB dealer called New Country Mercedes Benz, where van was inspected by technician on 08-15-23. I was told problem was overloaded alternator and serpentine belt failure. Cost to repair is around 9500 I told them I have solar Panel on roof and connected to my portable power bank battery and engine battery was never connected or used for my to power use for camping accessories. Driver for towing told MB had this problem and some vehicles were recalled, mine was not recalled.