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On the right track. Any "projectile" capable of penetrating to and into the radiator, will eventually "disable" the vehicle. The Achilles heel of any liquid cooled motor. A stone could do it.
Intending/attempting to "stop" a vehicle with conventional/typical small arms, bad tactics. I am acquainted with such a case, where the vehicle (admittedly a big one, as in 3-5 ton type truck) , well riddled, went 15 miles or more, and stopped 'cause it ran out of fuel. I was told a bullet had holed the side saddle fuel tank.
When it was over, a very terrified hitchhiker baled out as the driver was taken into custody! No LEO knew the hitcher was aboard.